December 8, 1975. Rehearing and Rehearing En Banc February 2, 1976.
Foorman L. Mueller, Chicago, Ill., John F. Spellacy, Ft. Lauderdale, Fla., LaValle D. Ptak, Phoenix, Ariz., for plaintiff-appellee-cross appellant.
Eugene F. Malin, Carl V. Wisner, Jr., Ft. Lauderdale, Fla., for defendant-appellant-cross appellee.
Appeals from the United States District Court for the Southern District of Florida.
Before TUTTLE, COLEMAN and SIMPSON, Circuit Judges.
SIMPSON, Circuit Judge:
Louis W. Parker, a professional inventor, brought suit against Motorola, Inc., alleging infringement of United States Patent No. 2,773,119 ('119), titled "Tuning System for Radio and Television Receivers". Motorola's answer denied infringement, and alleged invalidity of the '119 patent as obvious in light of prior art. Motorola's answer asserted invalidity of the patent for fraud in its procurement consisting of (a) material misrepresentations by Parker to the United States Patent Office, and (b) failure by Parker to satisfy the duty of complete candor and good faith required in the prosecution of a patent.
The complaint also named as defendants four sales subsidiaries of Motorola, Inc. However, the plaintiff voluntarily dismissed the complaint against three of the subsidiaries, and the district court dismissed the complaint as to the fourth.
The parties stipulated prior to trial that the suit would be tried as to alleged infringing subject matter on the Motorola color television receivers employing chassis TS-915 as representative of the Motorola chassis TS-915, TS-919 and TS-921 each of which has a fine tuning indicator, and on Motorola chassis TS-934, as representative of those Motorola television receiver circuits which have Automatic Fine Tuning (AFT).
The district judge found the Parker '119 patent valid, that the Motorola color television chassis TS-915 infringed the '119 patent, but that the Motorola color television chassis TS-934 did not infringe the '119 patent. The judgment was directed to be final except as to an accounting for damages for infringement, the ascertainment of which was referred to a Special Master. Motorola appeals from the judgment as to the findings of validity and infringement of the TS-915 chassis. Parker cross-appeals with regard to the finding of noninfringement by the TS-934 chassis. We reverse as to the validity of the '119 patent, and, hence, do not reach the issue of infringement. Hughes Tool Co. v. Ingersoll-Rand Co., 5 Cir. 1971, 437 F.2d 1106, cert. denied, 403 U.S. 918, 91 S.Ct. 2230, 29 L.Ed.2d 696.
PRESUMPTION OF VALIDITY
We consider initially the effect of the statutory presumption of validity normally attaching to patents which survive the scrutiny of the Patent Office. Title 35, U.S.C. § 282. This presumption is based upon (a) the acknowledged experience and expertise of the Patent Office personnel, and (b) recognition that patent approval is a species of administrative determination supported by evidence. Beckman Instruments, Inc. v. Chemtronics, Inc., 5 Cir. 1970, 439 F.2d 1369, 1374, cert. denied 400 U.S. 956, 91 S.Ct. 353, 27 L.Ed.2d 264; Neff Instrument Corp. v. Cohu Electronics, Inc., 9 Cir. 1961, 298 F.2d 82; Georgia Pacific Corp. v. United States Plywood Corp., 2 Cir. 1958, 258 F.2d 124, 133, cert. denied 358 U.S. 884, 79 S.Ct. 124, 3 L.Ed.2d 112. While we have sometimes failed to define the quantum of proof necessary to rebut the presumption, we have held that the applicable standard is proof greater than a mere preponderance of the evidence. Railex Corp. v. Speed Check Co., 5 Cir. 1972, 457 F.2d 1040, 1043, cert. denied 409 U.S. 876, 93 S.Ct. 125, 34 L.Ed.2d 128; Hobbs v. United States Atomic Energy Commission, 5 Cir. 1971, 451 F.2d 849, 856. The court below alternatively applied the standards of clear and convincing proof and proof beyond a reasonable doubt, and held that under either Motorola had failed to carry its burden. This was the underpinning for the holding of validity of the '119 claims.
Conclusions of Law Nos. 2, 3, 4, and 5.
However, despite any ambiguity in this court's opinions as to the applicable standard of proof, we have made it clear that when a defendant in an infringement suit attacks the validity of a patent on the ground that it was issued without consideration by or presentation to the Patent Office of pertinent prior art, the reason for the presumption dissipates, and the presumption is weakened. Harrington Manufacturing Co., Inc. v. White, 5 Cir. 1973, 475 F.2d 788, 795, cert. denied 414 U.S. 1040, 94 S.Ct. 542, 38 L.Ed.2d 331; Beckman Instruments, Inc., supra at 1374; Johns-Manville Corp. v. Cement Asbestos Products Co., 5 Cir. 1970, 428 F.2d 1381; Ingersoll-Rand Co. v. Brunner Lay, Inc., 5 Cir. 1973, 474 F.2d 491, 496, cert. denied 414 U.S. 865, 94 S.Ct. 125, 38 L.Ed.2d 117; Cornell v. Adams Engineering Company, 5 Cir. 1958, 258 F.2d 874. In these circumstances a court must as a minimum scrutinize the patent claims in suit more closely than when the presumption is at full force. Gaddis v. Calgon Corp., 5 Cir. 1975, 506 F.2d 880, 885; Garrett Corp. v. American Safety Flight Systems, Inc., 5 Cir. 1974, 502 F.2d 9. The file wrapper of the Parker `119 patent discloses that the Patent Office did not consider the prior art references relied upon by Motorola in its defense of invalidity, so that here the Section 282 presumption was diluted.
See note 11 infra.
Additionally where — as here — evidence of unconsidered prior art appears in combination with evidence of omissions or inaccuracies in the materials presented to the Patent Office in support of the application, the bases for the statutory presumption disappear. See Armour and Company v. Swift Co., 7 Cir. 1972, 466 F.2d 767; National Filters, Inc. v. Research Products Corp., 5 Cir. 1967, 384 F.2d 516, 520; Lodge Shipley Co. v. Holstein and Kappert, S.D.Tex. 1970, 322 F. Supp. 1039; Ansul Co. v. Uniroyal, Inc., S.D.N.Y. 1969, 301 F. Supp. 273, affd. 2 Cir. 1971, 448 F.2d 872, cert. denied 404 U.S. 1018, 92 S.Ct. 680, 30 L.Ed.2d 666. Because the district court ignored the effect of the above factors on the statutory presumption of validity we examine the claims of the '119 patent more carefully than would be necessary otherwise.
Even though the presumption is seriously weakened we will construe the claims of the '119 patent as narrowly as possible so as to avoid the prior art to the extent that such a construction comports with reason. Sterner Lighting, Inc. v. Allied Elec. Supply, Inc., 5 Cir. 1970, 431 F.2d 539, cert. denied 401 U.S. 909, 91 S.Ct. 869, 27 L.Ed.2d 807. In addition, close examination of the file wrapper history of the '119 patent is necessary not only for a proper construction of the patent claims, but also because of Motorola's contention that the patent was obtained by Parker by misrepresentations to the Patent Office. Waldon, Inc. v. Alexander Manufacturing Co., 5 Cir. 1970, 423 F.2d 91, 93; Bros. Inc. v. W. E. Grace Manufacturing Co., 5 Cir. 1965, 351 F.2d 208, 213, cert. denied 383 U.S. 936, 86 S.Ct. 1065, 15 L.Ed.2d 852.
THE '119 PATENT
The district court found that the '119 patent discloses, in its claims, specifications, and drawings, tuning indicator circuits which provide either a visual indication, an audible indication, or both such indications when a television or a radio receiver is manually tuned by the operator to the peak-tuned position. The '119 patent for a visual tuning indicator discloses a tuning eye indicator with relatively movable luminous arcs. The tuning eye tube circuit of the '119 patent is energized by a superheterodyne receiver, for the purpose of providing a visual indicator to tell the operator who is manually tuning the receiver when the peak-tuned position of the picture is obtained, without his need to observe the picture as it is reproduced on the picture tube of the receiver. This tuning indicator circuit is exactly that and no more. It does not affect the picture, which still must be adjusted to peak-position on the picture tube by manipulation of a tuning knob.
The television receiver employed in the '119 patent to energize the tuning indicator circuit is described as a black and white receiver with superheterodyne circuitry, i. e., having a relatively broad pass band, preferably of the intercarrier sound type. The radio receiver disclosed in patent claim 17, here in suit, is of the frequency modulated (FM) type. The intercarrier sound receiver shown as the preferred embodiment of the '119 patent, was disclosed by Parker in U.S. Patent 2,448,908 ('908) issued on September 7, 1948. '908 expired on September 7, 1965. The '908 patent is cross-referenced in the '119 patent, and Parker stated in correspondence with the Patent Office that the '119 patent was an improvement on the prior '908 patent. The findings of the lower court in accord with the undisputed testimony at trial establish that the '119 patent is a combination patent, comprised of a television or a radio receiver and a tuning indicator circuit. The four patent claims alleged to be infringed by the Motorola chassis, claims 3, 5, 14, and 17 break down into two parts: (1) an intercarrier sound receiver, as disclosed in the '908 patent, combined with (2) a tuning indicator circuit designed to provide a visual indication of optimum tuning. Furthermore, the manual tuning system of the '119 patent is identical to that of the '908 patent.
For purposes of trial, claims 3, 5, 14, and 17 were broken down by Parker into numbered paragraphs. One of Parker's expert witnesses acknowledged under cross-examination that each of the four claims in suit employs an intercarrier sound receiver as disclosed in the '908 patent. The witness testified that in claim 3 paragraphs 1-6, in dependent claim 5 paragraphs 1 and 2, in claim 14 paragraphs 1-9, and in claim 17 paragraphs 1-5 and 7, all read on the circuitry of the intercarrier sound receiver of the '908 patent. The remaining paragraphs of claims 3, 5, 14, and 17 describe the indicator and coupling circuitry that is combined with the intercarrier receiver. Some explanation of the basic elements of television broadcasting is helpful to an understanding of the application of the '119 patent to television receivers. We have labored to keep our explanation simple, but in order to achieve precision in dealing with technical subject matter the use of some technical terms is mandated. Basically, in television broadcast transmission, a camera tube is focused on the scene to be broadcast and converts the picture into a sequence of electrical elements which are amplified by wide band video amplifiers. These amplifiers, among other functions, furnish the input for a modulator, which modulates the video signals on the radio frequency carrier. The audio portion of the picture, picked up by means of a microphone, is also amplified and used to frequency modulate the sound carrier of the television transmitter. The picture or video signal, which is amplitude modulated (AM), and the audio or sound carrier signal, which is frequency modulated (FM), are then transmitted at a radio frequency into space for reception by a receiving antenna.
Reproduced in the Appendix, in order to aid in an understanding of the elements comprising each claim.
Although the '908 patent is for a television receiver, one of patentee Parker's expert witnesses stated that it was also applicable to a radio receiver as described in claim 17 of the '119 patent, since a television receiver is a special form of radio receiver.
In order to conserve space in the frequency spectrum, and to utilize the maximum of the restricted channel assigned to television for the transmission of a wide-band amplitude modulated picture signal, the Federal Communications Commission has since 1945 prescribed the vestigial sideband technique of transmission. In this type of signal transmission both sidebands of the carrier signal are not transmitted, as in double sideband transmission, but, rather, one of the generated side bands, which contain identical information, is transmitted and only a portion of the other sideband adjacent to the carrier frequency is transmitted. The frequency modulated audio carrier is transmitted on adjacent frequencies. As an aid to understanding of the discussion to follow, we are reproduce Figures 1, 2, 3, 4, 5 and 6 of the '119 patent.
Figure 3 of the '119 patent, reproduced herewith, depicts graphically the acceptance curve for a television receiver designed to receive vestigial sideband signal transmissions in conformity with the requirements of the F.C.C. The picture of video carrier signal is indicated by the vertical line near 20, and the sound or audio carrier signal is indicated by the vertical line 22.
Figure 2 of the '119 patent, reproduced herewith was chosen by Parker to show the form of the invention. It depicts a superheterodyne intercarrier sound television receiver, designed to receive vestigial sideband transmissions, combined with a tuning indicator circuit as disclosed in the '119 patent. The transmitted signals from the broadcast antenna, as described above, are picked up by the receiving antenna (1), connected to a tuner at the Front End (2) of the receiver, which converts the frequency to an intermediate frequency (IF). The signal is then amplified in the IF amplifier (3), where it receives the bulk of the amplification or gain necessary to operate the picture tube (7) and the loudspeaker (17). The amplified signal from the I.F. amplifier passes through a coupling system, which includes a coil (4) and a video detector (5). The video signal then passes through the video amplifier and D.C. restorer (6) to the picture tube (7). The audio signals taken off by lead (8), are further amplified and used to "drive" (make it function) the loudspeaker (17).
As already noted, the television receiver in the '119 patent reads on the claims of the prior Parker '908 patent, which disclosed an intercarrier sound television receiver. The distinction between intercarrier television receivers and "conventional" television receivers lies in whether the video and audio signals are separated prior to detection. In a "conventional" receiver the video and audio carriers are separated prior to detection so that no sound components, which may cause video interference, reach the video detector. From there the respective carrier signals are fed to separate audio or video IF (intermediate frequency) detectors. As a result, the operator of a "conventional" receiver must tune for the best sound and accept the accompanying picture. In an intercarrier sound receiver the audio carrier and the video carrier are amplified in the same IF amplifier. The two carriers are then heterodyned in the video detector and a new carrier is produced. This new carrier has an IF equal to the difference between the two carrier frequencies and contains the FM sound information, which is then led off and detected. The tuning in an intercarrier receiver is very broad, permitting the operator to tune for the best picture while retaining good sound.
The use of the term "conventional" to describe non-intercarrier sound television receivers may be misleading. The testimony at trial established that "conventional" is used to describe these receivers because they were used prior to the invention of intercarrier sound receivers. We are told that the vast majority of television receivers in use today employ intercarrier sound circuitry.
Combined with the intercarrier receiver of the '908 patent in the '119 patent is a tuning indicator circuit as illustrated by Figure 2. The superheterodyne circuit in the '908 patent receiver and in the '119 patent receiver provides an IF carrier signal available at the output of the IF amplifier. Although as stated above the television receivers in both patents have two carrier signals at the output of the IF amplifier, the tuning indicator in the '119 patent is operated by the video carrier signal. The indicator circuit is connected to the receiver by a switch (39) with the switch arm (40) in the position indicated in Figure 2. The video carrier signal passes over a line (50) through the switch and the buffer tube (51), and through a tuned output transformer, comprised of two tuned sections (52a, 52b). The signal is then fed to a diode rectifier (53) and filter (26) to the tuning indicator (27). As previously noted, the sole purpose of the tuning indicator circuitry in the '119 patent is to provide a visual or audible indication of peak or optimum tuning; the indicator circuit itself has no effect on the picture being manually tuned by the operator.
THE FILE HISTORY OF THE '119 PATENT APPLICATION
The original patent application for the '119 patent was filed by Parker on April 4, 1950, and included twenty-three claims. Those claims covered a tuning indicating system for a television or radio receiver, which encompassed a tuning indicator circuit. The original twenty-three claims were rejected by the Patent Office Examiner as unpatentable over the prior art on February 9, 1951. Patentee Parker subsequently cancelled the twenty-three claims, amended the specifications, and presented a second set of eleven claims. The amended claims covered a television or radio receiver, in combination with circuitry which provided a visual or audible indication of tuning. These claims were rejected by the Examiner by Office Action dated July 3, 1952, as being unpatentable over the prior art or as indefinite. By amendment, filed October 6, 1952, Parker cancelled the eleven claims, and presented a third set of twenty-three claims. This set of claims included claims 39, 41, and 58, and became final patent claims 3, 5, and 14, respectively, which Parker now asserts the Motorola chassis infringed. On July 17, 1953, claim 58 was rejected by the patent Examiner as containing "new matter" not contained in the patent specifications. Claims 39 and 41 were indicated by that action to be presently allowable. In response to this action Parker sought to traverse the rejection of claim 58 by calling the Examiner's attention to the reference to the '908 patent, disclosing an intercarrier circuit for television receivers, which appeared in the specifications of the '119 patent. In this same correspondence, dated October 19, 1953, Parker added three additional claims to the prosecution of the patent. One of these was claim 61, which became final claim 17, here in suit.
On January 21, 1955, the Examiner rejected claims 39, 41, 58, and 61 on the basis of the newly discovered Bradley Patent No. 2,355,701, since the "means for effecting an indication" in the '119 patent application was inherent in an automatic gain control circuit, in which the reproduction of both picture and sound will vary with tuning. Additionally, the Examiner again rejected claim 58 as including "new elements", since the general reference to the '908 patent was an insufficient basis for the recitation of the specific elements claimed. An amendment to the application was made by Parker on March 21, 1955, amending claim 39 and, therefore, dependent claim 41, to limit them more specifically to a tuning indicating system with a tuning indicator. In support of the allowance of those claims Parker argued that the amendment more clearly limited the claim to distinguish patentability over Bradley, since the automatic gain control circuit disclosed in the latter patent had been identified by the Examiner as the prior art basis for rejection. The pertinent part of claim 39 after the addition of this amendment read as follows, with the language added by the amendment indicated by italics:
"selective means peaked to a frequency on the said rising portion of said curve, the selective means being sharply peaked as compared to the width of the video modulations and being connected to the first-named means and energized by said radio frequency signal, and tuning indicator means controlled by said selective means for effecting an indication useful in tuning the receiver which varies with variations in the output of the selective means."
In the remarks accompanying the amendment Parker stated that the insertion of "tuning indicator" in claim 39 distinguished it from the Bradley patent, because the latter contemplated an automatic gain control circuit which was not per se a tuning indicator. Parker stated that the claims were revised "to direct them more particularly to a tuning indicator", since the absence of the tuning indicator had presumably been the basis for the rejection.
Parker's remarks accompanying the amendment to claim 39 stated in part:
"The newly cited patent to Bradley 2,355,701, is not believed to meet any of the claims as amended for the reason that Bradley contemplates an automatic gain control circuit. . . . No one has ever conceived that an automatic gain control circuit per se was a tuning indicator.
In view of the fact that it is well known that an automatic gain control circuit cannot function as a tuning indicator, the rejection by the Examiner is presumably based on the fact that the claims were not properly directed to tuning indicators. In short, the Examiner took the position that the claims failed to recite that the device was a tuning indicator but used broad language whereby they could be confused with the automatic gain control of Bradley.
Consequently, applicant has revised the claims to direct them more particularly to a tuning indicator." (Emphasis added).
In the remarks accompanying the March 21, 1955 amendment Parker also traversed the rejection of claim 58, as containing "new matter", on the basis that it read "element for element" upon the drawings accompanying the patent application, and that the application itself "has everything shown in the prior patent '908 and is an improvement thereon". Claim 58 was also sought to be distinguished from the Bradley patent on the basis of the last clause in the claim which called for:
". . . means for indicating the amplitude of the current flow in said resonant means." (Emphasis added).
Claim 61 was asserted to be distinguishable over Bradley by reason of the particular language contained in that claim calling for a tuning indicator. Parker's remarks in the March 21 amendment with regard to claim 61, stated:
"Claim 61 is patentable over Bradley since it calls for:
. . . tuning indicator means controlled by said selective means for effecting an indication useful in tuning the receiver when the frequency of the signals fed to the selective means approaches the frequency of the selective means." (Emphasis added).
This distinguishing language, however, did not appear in claim 61 as it then read, nor was it ever added to that claim by means of an amendment. The last clause of claim 61 actually read at that time and in final claim 17:
"and means controlled by said selective means for effecting an indication when the selective means is being fed with signals whose frequency corresponds to the resonant frequency of the selective means."
At trial patentee Parker sought to explain through the testimony of William Hall (who prosecuted the patent application for him at that time) how the inaccurate quote came to appear in the March 21, 1955 correspondence. Hall testified that it was the usual practice in his office, at the time, for the attorneys not to dictate quotations from the claims, but rather in dictating correspondence relating to patent applications to instruct the stenographers where to find the claim language to be quoted and for them to copy the appropriate language. Therefore, Hall "assumed" that the stenographer had quoted the "wrong thing" in preparing the March 21 correspondence. However, the file history of the '119 patent shows that the above language never appeared in any other claim. Further, the file history indicates that neither the Patent Office nor Parker at any time in the further prosecution of the patent ever alluded to the fact that the language — purportedly appearing in Claim 61 and quoted in the remarks of March 21 urging allowance of the claim — did not actually appear in the claim either as it then read or in the final patent claim.
On December 28, 1955, the Patent Examiner, in response to the correspondence dated March 21, 1955, notified Parker that patent claims 39, 41, and several other claims were presently considered allowable. When Parker received this communication he requested that the patent application be passed to issue. By action dated March 7, 1956, the Patent Office notified Parker of the allowance of the '119 patent, consisting of nineteen claims including claims 39, 41, 58, and 61, and final claims 3, 5, 14, and 17.
On August 24, 1956, Parker filed an amendment after allowance under Patent Office Rule 312. The Rule 312 amendment amended the last clause of claim 39, which, as we have noted above, had previously been amended so as to distinguish the Bradley patent. The claim was altered by the amendment to read:
The Manual of Patent Examining Procedure, Section 714.16, at the time the amendment was filed, provided:
"Rule 312. Amendments after allowance. Amendments after the notice of allowance of an application will not be permitted as a matter of right, but may be made, if the printing of the specification has not begun, on the recommendation of the Primary Examiner, approved by the Commissioner, without withdrawing the case from issue.
The Commissioner has delegated the approval of such recommendation to the Supervisory Examiner."
"selective means peaked to a frequency on the said rising portion of said curve, the selective means being sharply peaked as compared to the width of the video modulations and being connected to the first-named means and energized by said radio frequency signal, and energized by said selective means for producing a signal indicative of the tuning adjustment of said receiver and useful to effect accurate tuning thereof to a received signal."
Hence both of the limitations added by the March 21, 1955 amendment to distinguish the claim from the Bradley patent, "tuning indicator" and "useful in tuning the receiver", were eliminated. In the remarks accompanying the 312 amendment Parker stated with regard to the last clause of claim 39:
The Manual of Patent Examining Procedure, Section 714.16(a) provided as of the time the amendment was approved:
"Recommendations concerning any [Rule 312] amendment affecting the disclosure of the specification or drawing, or adding claims, or changing the scope of any claim shall be submitted to the Supervisory Examiner.
"The claim has also been modified in its final clause but not such as to depart from the scope of the invention."
The 312 amendment was approved by the Supervisory Examiner on August 31, 1956, and the Parker '119 patent was issued on December 4, 1956.
VALIDITY OF THE '119 PATENT
Congress has implemented the constitutional standard of patentability by statutes providing that the patentability of an invention depends upon its satisfying the three criteria of novelty, utility, and non-obviousness. Title 35, U.S.C. §§ 101, 102, 103. The appellant Motorola contends that the '119 patent claims at issue on this appeal are invalid under Section 103 because the combination of elements disclosed in those claims was obvious in light of the prior art. The prior art upon which appellant relies to support this claim consists of: (1) four patents not cited by the Patent Office or Parker in the prosecution of the '119 patent application: Holmes U.S. Patent 2,056,607, issued October 6, 1936, Foster U.S. Patent 2,121,736, issued June 21, 1938, Chittick U.S. Patent 2,123,001, issued July 5, 1938 and Mountjoy U.S. Patent 2,135,946, issued November 8, 1938; (2) the National Radio Institute Study Manual, 31FR-1 (1946); and (3) the prior Parker '908 patent. While the appellee, Parker, concedes that the '119 patent is a combination patent, he argues that the elements were combined in that patent in a new and non-obvious manner.
Title 35, U.S.C. § 103 provides:
"A patent may not be obtained though the invention is not identically disclosed or described as set forth in section 102 of this title, if the differences between the subject matter sought to be patented and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art to which said subject matter pertains. Patentability shall not be negatived by the manner in which the invention was made."
The ultimate question of obviousness in deciding patent validity is a question of law, but resolution of the issue requires several antecedent factual determinations. Graham v. John Deere Company of Kansas City, 1966, 383 U.S. 1, 86 S.Ct. 684, 15 L.Ed.2d 545; Garrett Corp. v. American Safety Flight Systems, Inc., 5 Cir. 1974, 502 F.2d 9. The Supreme Court in Graham, supra, identified three factual inquiries for resolution prior to a determination of the ultimate issue of obviousness under Section 103: (1) the scope and content of the prior art, (2) the differences between the prior art and the claims at issue, and (3) the level of ordinary skill in the art at the time the patent application was filed. 383 U.S. at 17, 86 S.Ct. at 694, 15 L.Ed.2d at 556. See Anderson's Black Rock, Inc. v. Pavement Salvage Co., 1969, 396 U.S. 57, 62, 90 S.Ct. 305, 308, 24 L.Ed.2d 258, 262; Metal Arts Co. v. Fuller Co., 5 Cir. 1968, 389 F.2d 319, 321; National Filters, Inc. v. Research Products Corp., 5 Cir. 1967, 384 F.2d 516, 517. These factual decisions by the trial court are binding upon an appellate court unless clearly erroneous. Rule 52(a), F.R.Civ.P.; Stamicarbon, N. V. v. Escambia Chemical Corp., 5 Cir. 1970, 430 F.2d 920, 926-28, cert. denied 400 U.S. 944, 91 S.Ct. 245, 27 L.Ed.2d 248. The ultimate legal questions of (a) validity versus invalidity and (b) non-obviousness versus obviousness of the invention as a whole depend for their solution in turn upon the result of such factual determinations. Graham, supra; American Seating Co. v. Southeastern Metals Co., 5 Cir. 1969, 412 F.2d 756. See Ziegler v. Phillips Petroleum Co., 5 Cir. 1973, 483 F.2d 858, 867, cert. denied 414 U.S. 1079, 94 S.Ct. 597, 38 L.Ed.2d 485.
Secondary considerations such as commercial success by the patentee and the failure of others to satisfy long felt needs of the industry, although relevant to determining obviousness are not essential to that determination. Graham v. John Deere Company of Kansas City, 1966, 383 U.S. 1, 17-18, 86 S.Ct. 684, 694, 15 L.Ed.2d 545, 556; Ingersoll-Rand Company v. Brunner Lay, Inc., 5 Cir. 1973, 474 F.2d 491, 495, cert. denied 414 U.S. 865, 94 S.Ct. 125, 38 L.Ed.2d 117.
We have distinguished between obvious and non-obvious devices on the basis of "whether `creative', as opposed to `mechanical', skills were required to make them." Becton, Dickinson Co. v. Sherwood Medical, 5 Cir. 1975, 516 F.2d 514, 518. Hence, in order to satisfy the non-obviousness requirement of Section 103, the device must evidence more skill and ingenuity than that possessed by an ordinary mechanic having skill in the relevant art at the time of the invention. AG Pro, Inc. v. Sakraida, 5 Cir. 1973, 474 F.2d 167, 171, supplemented on petition for rehearing, 5 Cir. 1973, 481 F.2d 668.
Furthermore, since the '119 patent claims at issue combine the teachings of the prior art, special strictness must be applied to be certain that the claims satisfy all of the prerequisites of patentability, and particularly Section 103. Hewlett-Packard Co. v. Tel-Design, Inc., 9 Cir. 1972, 460 F.2d 625. "Courts should scrutinize combination patent claims with a care proportioned to the difficulty and improbability of finding invention in an assembly of old elements." Great A P Tea Co. v. Supermarket Equip. Corp., 1950, 340 U.S. 147, 152, 71 S.Ct. 127, 130, 95 L.Ed. 162, 167. A device is not patentable if it consists of no more than a combination of old elements drawn from existing devices, and which produce results that would be expected from that combination by a person skilled in the relevant art. Lincoln Engineering Co. of Illinois v. Stewart-Warner Corp., 1938, 303 U.S. 545, 549, 58 S.Ct. 662, 664, 82 L.Ed. 1008, 1010. Only where a combination of old elements produces a "synergistic result", that is, results "in an effect greater than the sum of the several effects taken separately", is a device patentable. Anderson's Black Rock, Inc. v. Pavement Salvage Co., 1969, 396 U.S. 57, 61, 90 S.Ct. 305, 308, 24 L.Ed.2d 258, 261.
In considering the disclosures of the prior art references cited by appellant we are guided by the principles that obviousness may properly be based on a combination of references or on the prior art taken as a whole, Scaramucci v. Dresser Industries, Inc., 10 Cir. 1970, 427 F.2d 1309; Deere Co. v. Hesston Corp., N.D.Tex. 1970, 316 F. Supp. 866, aff'd 5 Cir., 440 F.2d 904, cert. denied 404 U.S. 829, 92 S.Ct. 67, 30 L.Ed.2d 58, and that not only the specific teachings of a reference should be considered but also the inferences which one skilled in the art would draw therefrom. Application of Preda, C.C.P.A. 1968, 401 F.2d 825; Application of Kamm, 1972, 452 F.2d 1052, 59 C.C.P.A. 753.
The trial court rejected the combination of the Chattick, Foster, and Mountjoy patents and the National Radio Institute Manual with the Parker '908 patent, on which appellant relied in support of its obviousness defense, stating with regard to each:
"(a) No teaching reference;
(b) The [article or patent] refers to an audio radio receiver having a single carrier, not a vestigial intercarrier television receiver."
The Holmes patent was found by the trial court to disclose a single side band receiver, tuned to the audio carrier, with AM video and AM audio signals. It was found to differ from the '119 patent since it did not teach the combination of a "tuning signal system and a vestigial side band intercarrier television receiver". The district judge further found that the patent claims alleged to be infringed were "unobvious at the time of filing of the patent in suit to a person skilled in the art of intercarrier television receivers".
Finding No. 32.
We find no error in the finding of the district court that none of the prior art references, except, of course, the '908 patent, cited by appellant employed a "vestigial intercarrier television receiver". However, intercarrier television receiver merely describes the receiver of the '908 patent which was prior art at the time the '119 application was filed, and vestigial side band describes the F.C.C. required system of television broadcast transmission. The disclosures of the Parker '908 patent have been discussed at length in connection with the scope of the '119 patent claims; as we have noted, the '908 patent discloses an intercarrier sound receiver, and has the same manual tuning system as the '119 patent. The superheterodyne circuitry of the '908 patent and in the '119 patent receivers provides an IF carrier signal available at the output of the IF amplifier. Although the television receivers in both patents have two carrier signals at the output of the IF amplifier, the tuning indicator circuit in the '119 patent is operated by and responsive to only one carrier signal. The superheterodyne circuit provides the IF signal used to operate the tuning indicator in the '119 patent, while the intercarrier circuit is used in the sound circuit of the receiver. The file wrapper and the '119 patent show that Parker claimed that the addition of a tuning indicator circuit to the intercarrier television receiver of the '908 patent was an improvement to that patent, and that the tuning indicator circuit was the thing which made the '119 claims patentable. Further, Parker argued during the prosecution of the patent that the tuning indicator circuit in the '119 patent was the element which distinguished the '119 claims over the prior art references cited by the Patent Office. See note 8, supra, and accompanying text. In the March 21, 1955, amendment to claim 39, and hence to dependent claim 41, Parker specifically added the language "tuning indicator" to the claim and thereby achieved its allowance. Although the added language was subsequently deleted by the Rule 312 amendment Parker specifically stated in urging the allowance of that amendment that the modification of the claim did not depart from the scope to the invention as previously allowed. Hence, he may not now be permitted to claim that the deletion of "tuning indicator" and "useful in tuning the receiver" materially changed the scope of the invention. See Rosen v. Kahlenberg, 5 Cir. 1973, 474 F.2d 858, 867; Hughes Tool Co. v. Varel Manufacturing Co., 5 Cir. 1964, 336 F.2d 61, 65. Similarly, claim 58 was distinguished from the Bradley device on the basis of the claim language calling for a "means for indicating", and in urging the allowance of claim 61 Parker purported to quote a portion of the language of that claim calling for a "tuning indicator". Therefore, the tuning indicator circuitry of the references cited by appellant is the relevant prior art on which the determination of obviousness depends.
The specifications of the '119 patent state:
"While it [the tuning indicator circuit] has special and unexpected advantages when used with the intercarrier circuit it includes features that are applicable to other circuits. Although its use with the vestigial side band system has been described, since it conforms to present preferred practice, and is particularly advantageous for this system, the invention in its broader aspects is not limited to such use."
At the outset of the discussion of the other prior art, which appellant Motorola maintains discloses the indicator circuitry of the '119 patent, we note that the Holmes, Chittick, Mountjoy, and Foster patents and the National Radio Institute publication all disclosed a superheterodyne receiver with an IF amplifier at the output of which there is a carrier signal. The tuning indicator circuit disclosed in the Chittick and Holmes patents and the National Radio Institute manual are coupled to the IF amplifier by coupling circuits, sharply tuned, which are responsive to a single IF carrier signal. The Foster and Mountjoy patents disclose automatic frequency control circuits (AFC) which are also responsive to the carrier signal at the output of the IF amplifier. For purposes of this appeal the prior art references on which Motorola principally relies are the Chittick and Holmes patents.
The Chittick device consists of an AM radio receiver with superheterodyne circuitry, which is manually tuned and utilizes a tuning eye tube as a visual indicator of peak tuning. The tuning indicator circuit is responsive to an audio carrier signal from the output of the IF amplifier, and is connected through a sharply peaked coupling circuit to the IF amplifier. In both the '119 patent and the Chittick device the tuning of the receiver is done manually, and the indicator circuitry itself does no tuning. Its sole purpose is to provide a visual indication of optimum tuning, without the necessity of listening to the sound or watching the picture as reproduced by the receiver.
The Holmes device discloses a superheterodyne television receiver that is manually tuned to the peak tuned position. The picture is obtainable on the cathode ray picture tube only when the receiver is tuned to peak position. The picture reception is controlled by an indicator circuit employing a "noise suppressor circuit" that is connected to the IF portion of the receiver circuit through a sharply tuned coupling circuit to an IF carrier signal. This "noise suppressor circuit" allows the carrier signal to reach the picture tube only when the receiver is properly tuned. The receiver employed in the Holmes device is a non-intercarrier or "conventional" television receiver. However, the tuning indicator circuit in Holmes can be responsive to the video carrier frequency, and that video carrier signal can be obtained at the output of the IF amplifier in the '908 patent.
In our determination of whether the lower court erred in finding that the '119 patent satisfied the requirement of nonobviousness, we note from these prior art references that it is clear that the carrier signal produced at the output of the IF amplifier in the '119 and '908 patents is the type of signal which was used in these prior art references to operate a tuning indicator. Further, the tuning eye tube in the '119 patent, co-invented by Parker in 1935, performed precisely the same function as the tuning indicators in the Chittick and Holmes patents. The fact that the Chittick device employs a radio receiver is of no significance in light of the fact that the indicator circuitry of the '119 patent responds equally to either a video or audio carrier signal, regardless of which it is connected to.
The National Radio Institute Study Manual relied upon by Motorola demonstrates that the use of a carrier signal from the output of an IF amplifier coupled to a tuning indicator circuit by sharply tuned coupling circuits, as disclosed in the Chittick and Holmes devices, would have been obvious to one skilled in the art in 1950, when the '119 patent application was filed. See Zero Manufacturing Company v. Mississippi Milk Producers Association, 5 Cir. 1966, 358 F.2d 853, 858, cert. denied 385 U.S. 841, 87 S.Ct. 93, 17 L.Ed.2d 74. To combine this circuitry with a tuning eye tube of the type invented by Parker in 1935, as was done in the Chittick device, and the intercarrier television receiver of the '908 patent would also have been obvious to one skilled in the art in light of the fact that this type of circuitry had been used in providing tuning indicators to the prior art receivers cited by Motorola, having a carrier signal or signals at the output of the IF amplifier precisely as does the '119 patent receiver.
From our examination of the claims of the '119 patent, and the prior art references cited by appellant, we find that the combination of old elements and principles employed in the patent does not perform a function different from that theretofore performed, nor does the combination produce "unusual or surprising consequences", Great Atlantic Pacific Tea Co. v. Supermarket Equipment Corp., 1950, 340 U.S. 147, 152, 71 S.Ct. 127, 130, 95 L.Ed. 162, 166-67, or a "synergistic result". Anderson's Black Rock, supra. In holding that the claims are void for obviousness, we necessarily disagree with the conclusion of the district court. To the extent that the district court's conclusion was based on factual findings we have exercised our authority to review the record for ourselves. Thereupon we determine that the non-obviousness findings below are clearly erroneous.
MISREPRESENTATIONS TO THE PATENT OFFICE
Motorola contends that the '119 patent claims in issue are invalid not only as obvious, but also because of misrepresentations by Parker to the Patent Office in the prosecution of the patent application. To support this contention appellant relies on the file wrapper of the '119 patent. First, our attention is directed to the representation by Parker in the amendment of March 21, 1955, that claim 61 contained the language "tuning indicator" and "useful in tuning the receiver", although as noted previously no such language appeared in that claim. Secondly, appellant cites the addition of the same phrases to claim 39 by the March 21 amendment, and their subsequent deletion by the Rule 312 amendment. Parker in response contends (i) that the inaccurate quotation of claim 61 was the result of a clerical error on the part of the attorney representing him in the prosecution of the application; and (ii) that the Rule 312 amendment was approved by both the Examiner and the Supervisory Examiner, and did not broaden the scope of the invention. The district court found "no evidence [of] willful, intentional or actual fraud, concealment or misrepresentation" to the Patent Office by Parker.
Our start is with the rubric that because the grant of a patent is affected with a public interest, an applicant owes "an uncompromising duty to report to [the Patent Office] all facts concerning possible fraud or inequitableness underlying the applications in issue." Precision Instrument Mfg. Co. v. Automotive Maintenance Mach. Co., 1945, 324 U.S. 806, 818, 65 S.Ct. 993, 999, 89 L.Ed. 1381, 1388; Kingsland v. Dorsey, 1949, 338 U.S. 318, 319, 70 S.Ct. 123, 124, 94 L.Ed. 123, 126. The concept that a patent is invalid because of misconduct by the patentee in proceedings before the Patent Office goes beyond the classical definition of fraud, and encompasses a wide variety of inequitable conduct. Carter-Wallace, Inc. v. Davis-Edwards Pharmacal Corp., 2 Cir. 1971, 443 F.2d 867, 881; Norton v. Curtiss, 1960, 433 F.2d 779, 793, 57 C.C.P.A. 1384. Although the type of misconduct before the Patent Office which results in the invalidity of a patent admits to no fixed parameters, it is necessary that there be some element of wrongfulness, willfulness, or bad faith. See Monsanto Co. v. Rohm Haas Co., 3 Cir. 1972, 456 F.2d 592, 597, cert. denied 407 U.S. 934, 92 S.Ct. 2463, 32 L.Ed.2d 817; A.H. Emery Co. v. Marcan Products Corp., 2 Cir. 1968, 389 F.2d 11, cert. denied 393 U.S. 835, 89 S.Ct. 109, 21 L.Ed.2d 106; Xerox Corp. v. Dennison Mfg. Co., D.C.N.Y. 1971, 322 F. Supp. 963, 969. Hence, mere negligent omissions or misstatements to the Patent Office do not provide sufficient basis for a finding of fraud or misrepresentation by an applicant for a patent. Xerox Corp., supra.
In Beckman Instruments, Inc. v. Chemtronics, Inc., 5 Cir. 1970, 439 F.2d 1369, cert. denied 400 U.S. 956, 91 S.Ct. 353, 27 L.Ed.2d 264, this Court held the patent in suit invalid (i) as anticipated by the prior art, and (ii) because of intentional nondisclosure to the Patent Office by the patentee in securing the patent. Id. at 1374-80. We found in Beckman, that the patentee deliberately withheld from the Patent Office knowledge of prior art, which would, if known by the Examiner, have resulted in the denial of the patent, and, therefore, the patent was invalid. Id. at 1374, 1378, 1379. Similarly, in both Armour Co. v. Swift Co., 7 Cir. 1972, 466 F.2d 767, and in Monsanto Co. v. Rohm Haas Co., supra, relied on by Motorola, there was evidence that the respective patentees made knowingly false statements and concealed material facts which would have resulted in the denial of the patent by the Patent Office.
The testimony of attorney Hall, unrebutted by Motorola, concerning the circumstances surrounding the inaccurate quotation of claim 61, places the blame for this error on the negligence of Hall and his office staff. With regard to claim 39 and the Rule 312 amendment of that claim, we have found above that Parker did not recapture the former scope of that claim by the amendment. Nor did he represent to the Patent Office or in this court that the amendment was intended to recapture the scope of the claim prior to the March 21 amendment, and the addition of the tuning indicator language. From a review of the evidence presented below we are not persuaded that the trial court was "clearly erroneous" in finding that Parker did not make material misrepresentations to the Patent Office in the prosecution of the '119 patent application. Rule 52(a), F.R.Civ.P.
Pursuant to Title 35, U.S.C. § 285, a court may award attorney fees to the prevailing party in patent litigation, in exceptional cases. This record contains no indication that Parker did not proceed in this litigation in good faith, under a bona fide belief that the patent claims were valid. It follows that we do not view this as an exceptional case justifying the award of attorney fees to Motorola.
We reverse the judgment appealed from as to its holding that patent '119 was a valid patent, on the ground of obviousness in light of the prior art. The district court's findings of infringement of the '119 patent by Motorola Chassis TS-915 falls with our reversal as to its holding of validity of the patent.
Discussion of Parker's cross-appeal as to the trial court's finding of non-infringement by Motorola Chassis TS-934 is also rendered unnecessary. We affirm as to the cross-appeal.
The district court's findings of lack of proof of fraudulent misrepresentation and concealment in the prosecution of the '119 patent are affirmed.
We decline to award attorney fees to Motorola, holding that this is not the "exceptional case" calling for such an award.
Costs are directed to be taxed against the appellee, Louis W. Parker.
Reversed in part; affirmed in part.
TUNING SYSTEM FOR RADIO AND TELEVISION RECEIVERS
Louis W. Parker, Little Neck, N. Y.
Application April 4, 1950, Serial No. 161,279
19 Claims. (CI. 178-5.8)a a, 1 2 3, 4 5, 6 7. 8 9 10, 11, 12, 13, 14, 15 16 17, 18 19 2 20 21 21 22, 18-19 4 18 18-19 19, 18-19 18 24 25, 26 27. 26 28 29 15. 17. 30 31 32. 29 29 15, 25 23. 25 33, 34. 2 7, 17. 27 23 27 29 27. 23 2 23 27 27 28 31 15. 35 11, 36. 35 18 25 35 37 38, 39 24 18; 40, 25. 41, 42 3, 43 44 38, 45, 46 38 40 37. 41 38 35 18 39 50 3 4. 40 51, 52 a 52 b 3, 10. 37 54 11 50 54 27 15, 40. 55, 26 28, 40, 56, 40 57 26, 27, 75 57 a a 60 61, 62 63 64, 65 5 66 67. 63, 66 60 18 62, 19 18 63 66. 18 19 62 65 18 70 71, 71 72 35, 36 25. 35 71; 70
References Cited in the file of this patent
UNITED STATES PATENTS
FOREIGN PATENTS(1) A television receiver of the vestigial side band type for receiving a video modulated carrier having a portion of one video side band removed and having a frequency modulated audio channel operating just beyond the other video side band, comprising in combination, (2) means tunable over a range of frequencies inclusive of those of the signals, to be received for producing a radio frequency signal having a band of modulations thereon conforming substantially to those on said received waves, said means including (3) an element for passing said radio frequency signals, said element having at its upper end an acceptance curve which includes a small portion of said first side band and which is rising as it crosses from the lastnamed to the remaining side band, said acceptance curve including at its other end the frequency modulated audio signal modulations, (4) a detector for detecting the output of said element, (5) means amplifying the detected output and utilizing it for producing a picture, (6) a selector for extracting the frequency modulated audio signals from the detected energy, (7) selective means peaked to a frequency on the said rising portion of said curve, (8) the selective means being sharply peaked as compared to the width of the video modulations and being connected to the first-named means and energized by said radio frequency signal, and (9) means energized by said selective means for producing a signal indicative of the tuning adjustment of said receiver and useful to effect accurate tuning thereof to a received signal. (1) A television receiver as defined by Claim 3, in which said tunable means is a radio receiver of the superheterodyne type, (2) said element being a part of an intermediate frequency amplifier stage, (3) said selective means being connected to an intermediate frequency amplifier and being responsive to the modulated intermediate frequency signal. (1) In a television receiver for a television system in which a picture signal carrier is amplitude modulated and the complemental sound signal is transmitted as a frequency modulation of a second carrier, in combination, (2) an amplifier, (3) means for supplying said picture and sound carriers of a television signal to said amplifier, (4) a detector supplied by said amplifier, and (5) a selecting circuit connected between said amplifier and said detector and having a frequency characteristic such that both picture and sound carriers are passed to said detector, (6) the two carriers being heterodyned with each other in the detector, (7) means in the selecting circuit for modifying the characteristics of that circuit so that it is characterized by substantially zero slope over the range of frequency swing of the sound carrier and has an amplitude level below the minimum modulated amplitude of the amplitude-modulated picture signal carrier, (8) whereby the output from said detector contains both detected video signals and undetected frequency modulated audio signals, and (9) a detector responsive to the undetected signals to produce the audio signals, (10) resonant means connected to said amplifier and peaked sharply to the picture signal carrier frequency in the output of said amplifier, and (11) means for indicating the amplitude of the current flow in said resonant means. (1) A radio receiver for receiving a wave which has a carrier having a wide band of modulations on it together with an additional audio modulated signal the frequency of which varies within limits outside of said wide band, comprising in combination, (2) tunable input means for producing in its output a radio frequency signal having both of said modulations on it, (3) a detector for rectifying the output of said input means, (4) a selector for passing said additional modulations, (5) audio means responsive to the output of said selector, (6) selective means sharply peaked as compared with the width of said wide band and connected to said input means, (7) said input means having an acceptance band broad enough to include both of said modulations and (8) the selective means being peaked to a frequency corresponding to the carrier frequency of said radio frequency signal when the tuning means is tuned to optimum position, and (9) means controlled by said selective means for effecting an indication when the selective means is being fed with signals whose frequency corresponds to the resonant frequency of the selective means. This invention relates to a tuning system for radio and television receivers, and particularly for such receivers which have a tuned circuit with a relatively wide pass band. This condition is found in receivers for frequency modulated carrier waves, and in television receivers, especially where the vestigial side band system of transmission is used. The invention is particularly advantageous for television receivers which employ the intercarrier circuit. This circuit, which is disclosed in the present inventor's Patent No. 2,448,908, preferably employs a superheterodyne circuit having a single I. F. amplifier for both the AM video carrier and the FM audio carrier, the output of the second detector including a beat frequency produced by the carriers that is frequency modulated by the audio signals. This beat frequency passes through a selector and limiter to the usual discriminator, amplifier and loud speaker circuits for the audio signals. The acceptance of the I. F. amplifier in this circuit is made sufficiently broad, in order to pass the video and audio bands, so that when the receiver is tuned to a station the tuning may be varied considerably without changing the volume from the loud speaker; and accurate tuning therefore depends on observation of the picture quality. This arrangement is subject to certain drawbacks. It is difficult to detect poor picture quality when certain types of pictures are received; too much dependence is placed on the operator's judgment and care, which are subject to wide individual variations; and picture quality is not sharply peaked, but varies gradually in the neighborhood of correct tuning, requiring care and close attention to get the best results. The same problem is present in intercarrier television receivers which employ a common tuned radio frequency circuit for amplification of both the video and the audio carriers, since the acceptance of the TRF circuit must be broad enough to pass both carriers. It is also present in receivers for frequency modulated carriers, since the amplification circuit must have sufficiently broad acceptance to pass all frequencies within the modulation range of a carrier without distortion. A general object of the invention is to provide a novel tuning system for television receivers that is not dependent on observation of picture changes, and which has a sharply packed response to tuning. One purpose is to provide such a tuning system that is adapted to operate in substantially the same manner as standard radio tuning systems, so that prospective television receiver purchasers will not be deterred by strange tuning devices. The invention facilitates the practical and effective use of continuous tuning arrangements having control knobs similar in appearance and operation to those on radio receivers. Another purpose is to provide an improved tuning system for television receivers employing the intercarrier system which will operate with greater speed, accuracy and convenience. More specific objects are to furnish a visual indication of correct picture tuning, such as a tube of the "tuning eye" type; an audible indication by producing a sharp peak of sound volume when tuning is correct; and a combination of these two types of indicators. Another purpose of the invention is to provide a tuning indicator circuit that can be used when FM broadcasts of sound alone are being received. This is applicable both to receivers of FM broadcasts alone, and to television receivers that have a special circuit for FM broadcast reception. In the latter instance a specific feature is the provision of a tuning circuit arrangement that uses the same main circuit elements for both television and sound broadcast reception. A further important object is to furnish a tuning indicator system that is relatively simple and inexpensive, and which can be incorporated in existing television circuits without extensive changes. These and other objects and advantages will appear from the following description of a preferred embodiment of the invention, in conjunction with the accompanying drawings, in which: Fig. 1 is a diagram of a television receiver circuit employing the intercarrier system, with superheterodyne amplification, and embodying the invention, including an inductively coupled indicator circuit; Fig. 2 is a similar diagram, showing buffer amplifier coupling of the indicator circuit; Fig. 3 is a graph of the acceptance curves of the receiver I. F. circuit and of the indicator circuit; Fig. 4 is a diagram of a modification of the indicator circuit; Fig. 5 is a diagram of a modification of the initial portion of the circuit shown in Fig. 1 up to the line — illustrating the application of the invention to such a circuit employing tuned radio frequency amplification; and Fig. 6 is a diagram of an FM broadcast receiver circuit embodying the invention. The invention is illustrated in Figs. 1 and 2 by its use in a television receiver of the superherterodyne type employing the intercarrier circuit. Since this circuit is well known and has been extensively described in publications, only the portions pertinent to this invention are shown in detail. In the form illustrated in Fig. 1 the incoming signals picked up by antenna pass through the conventional front end of a television receiver, having the usual tuning controls, to the I. F. amplifier which transmits them through a coupling system including coil to video detector from which they pass through video amplifier and D.C. restorer to picture tube The FM audio signals, carried by the beat frequency, are taken off by lead and pass through selector and limiter circuit terminating in pentode discriminator input coil output coils rectifier filter amplifier tube and power amplifier to loud speaker in accordance with well known practice. At the input end of the indicator circuit is a coil coupled to an inductance in the I. F. amplifier, such as output coil 4, and tuned by condenser to a frequency that will produce the maximum pickup by the indicator circuit when the front end is correctly tuned to an incoming picture carrier. The invention is illustrated in its application to the vestigial side band receiver described in the abovementioned patent. In a receiver of this type, as indicated in Fig. 3 the video carrier intermediate frequency is located at about the midpoint of the slope at the high frequency end of the acceptance curve of the I. F. amplifier at its output end, the amplifier being designed to provide maximum amplification for the lower side band. At its other end curve drops sharply to the audio carrier frequency described in said patent. Under the system now in force in the United States the audio and video carrier frequencies are spaced by 4.5 mc.; and in the illustrated I. F. amplifier the audio intermediate frequency is 21.25 mc. and the video intermediate frequency is 25.75 mc. The circuit is tuned to substantially the correct video I. F. carrier frequency, and its acceptance curve is sharply peaked, especially since coils and are advantageously coupled so that a minimum of energy is extracted from the main circuit by the indicator circuit. This coupling must be loose enough so that it does not appreciably affect the selectivity curve. It has been found that for greatest tuning precision with the illustrated side band system, the indicator input circuit should be tuned to a frequency very slightly below the correct video intermediate frequency, the difference being only of the order of 0.1 mc. under standard conditions. This precise tuning setting can best be obtained empirically, as by tuning variable condenser adjusting it for maximum input into the indicator circuit when the correct video carrier frequency is passed through the I. F. amplifier. However, this is a tuning refinement that is not absolutely necessary to satisfactory operation, and is intended to be included in the description of input circuit as substantially tuned to the video intermediate carrier frequency. Coil is connected by lead to the negative side of rectifier which may be a crystal or other suitable type. The rectifier output passes through a filtering and attenuating network to tuning indicator This may be a tube of the well-known "tuning eye" type, such as tube type 1629, in a suitable circuit. This type of tube has a visible target with a luminous are varied in extent by changes in tuning, and for convenience will be referred to herein as a tuning eye tube. It should be noted, however, that in the present instance, since positive control potential is supplied to the tube, it will operate in reverse, with the maximum gap between the ends of the luminous arc when tuning is correct. The rectified output will not vary with changes in picture content since the rectifier operates only on synchronizing signal peaks, as would a peak voltmeter. The manner in which this is accomplished will be described later. The output of network is also applied through resistor to the control grid of audio amplifier tube This grid is biased, relative to the cathode, to a negative bias substantially more negative than the correct value for optimum amplification, resulting in a low level of sound output and weak signals from loud speaker This bias may be produced in various ways. In the form illustrated, in addition to the use of biasing resistor in the cathode circuit, an appropriate positive potential is applied to the cathode, as by connecting the cathode through resistor to a positive potential source, which advantageously is the usual plate potential source The bias potential of grid is selected so that, when the maximum current flows in the indicator circuit, the resulting positive potential applied by the latter circuit to grid will raise the grid potential to the correct value for optimum audio amplification. Although in the illustrated embodiment the fixed grid bias, and the variable grid bias from the indicator circuit, are shown as applied to the same grid of the tube which has only one operative control grid, the invention in its broader aspects is not limited to this arrangement or to the type of tube shown, since similar results can be obtained by utilizing multiple control grids of a suitable tube, such as type 61.7. The indicator circuit includes an arrangement which maintains the sound volume at a steady level during tuning. In the form shown, this arrangement applies to the output of rectifier a D.C. potential whose value is higher than that produced by undesirable sound signals, such as side band frequencies and noises, but of course substantially lower than the channel tuning peaks This procedure is sometimes described as introducing a delay factor or delay bias; but it should be understood that the term does not refer to a time delay in such cases. In the illustrated circuit the result is obtained by connecting the output of rectifier to a source of positive potential which may be the plate potential source connected through a suitable dropping resistor The operation of the system as thus far described is as follows: When the receiver is being tuned to the frequency of a desired channel the indicator circuit is not affected until the front end is tuned sufficiently close to the correct setting so that the incoming signals are carried by an intermediate frequency within the pass band of amplifier 3, a picture of some type appears on the screen of tube and sound is heard from speaker Tuning indicator may indicate reception of such signals; but owing to the peaked characteristic of the indicator circuit, the D.C. voltage applied to indicator and grid will be so low that neither the visual indication nor the sound volume will be materially affected until the tuning approaches closely to the correct value. Upon such approach the sound volume will rise sharply, the width of the dark gap in the tuning eye tube will change noticeably, and when tuning is precisely correct, slight changes in either direction will cause a noticeable drop in sound volume and a substantial change in the appearance of the indicator The operator will therefore tune to a well-defined peak of sound, to a definite indicator position, or to both, without the necessity of judging picture quality. This type of operation can be obtained with tuning controls of any desired type devoted solely to tuning the front end to the correct wave length, and eliminates the need for special types of tuning heretofore used in television receivers. It is pointed out that with this system the tuning affects the volume of sound, not its quality, which is harder to judge. It should also be noted that, while the sides of curve are steep, it will be sufficiently broad at the top to permit the oscillator-generated frequency in the front end to drift considerably without producing any noticeable change in the sound or the picture. Such a drift generally occurs as the set warms up; and the width of the top of curve between the steep sides is sufficient to eliminate the need for returning after initially tuning to the right setting. While both a visual indicator and a sound volume varying arrangement are shown and can be used in combination as in many radio receivers, it will be evident that either type of tuning indication may be used alone, either by omitting the indicator or by eliminating the connections through resistors and to tube Television receivers are frequently arranged to receive FM sound broadcasts without pictures; and when the intercarrier circuit is used it is necessary to employ an additional oscillation generating circuit to provide a carrier which replaces the video carrier and produces the beat carrier for the sound. Since the carrier for the generating circuit does not vary in frequency during tuning, the previously described indicator circuit is ineffective for reception of sound broadcasting. As already noted, a feature of the invention is the provision of a circuit that overcomes this difficulty; and a specific feature is the utilization of the major part of the television indicator circuit heretofore described, for FM sound broadcast tuning indication. This is accomplished in general by providing a second pickup circuit coupled to the audio circuit of the television receiver, where the frequency is of course varied by the tuning, and substituting the second pickup circuit for the pickup circuit described above, when the receiver is switched to FM sound broadcast reception. This is illustrated in Fig. 1, in which a second pickup coil is inductively coupled to a coil in the audio circuit, such as discriminator input coil and is tuned to the audio carrier frequency by shunt condenser A switching arrangement is provided for substituting coil for coil in the input circuit to rectifier when the oscillation generating circuit for FM sound broadcast reception is switched on. In the embodiment shown, coil is connected to point of double pole throw switch whose point is connected through lead to pickup coil and switch arm which contacts said points alternatively, is connected to the input of rectifier An oscillator which generates the video carrier intermediate frequency wave (25.75 mc. in the example given), has an output lead connected to the input of the I. F. amplifier and a plate potential lead connected to point of switch engaged by switch arm connected to source of plate potential, when the switch is in left hand or sound broadcast receiving position, with arm contacting point With this arrangement oscillator is inactive when switch is in right hand or television receiving position, and is energized when the switch is thrown to the left, simultaneously with the substitution of the coil for coil in the indicator circuit input. This arrangement therefore utilizes the main portion of the indicator circuit for both types of reception. It may be desirable in some cases to avoid the effects of inductive coupling of the indicator circuit to the main circuit, as shown in Fig. 1; and a similar circuit, using conductive coupling and a buffer tube, is illustrated in Fig. 2. The circuit is largely the same as the one previously described, and corresponding parts are indicated by the same numerals. In this embodiment switch point is connected by lead to the output of amplifier through coil Switch arm is connected to the control grid of buffer tube whose output is fed through a tuned output transformer to the indicator circuit rectifier. In the form illustrated the transformer comprises two tuned sections and in series, tuned respectively to the video carrier intermediate frequency in amplifier and to the audito carrier frequency at the output of tube With this arrangement either of these frequencies will be passed with low impedance, while other frequencies will be effectively blocked. It should be understood that, although the illustrated embodiment employs a simple, practical tuned transformer arrangement in Fig. 2 which eliminates the need for switching at this point, the showing is not intended to be restrictive or limiting. It will be noted that the rectifier in Fig. 2 is shown as a diode; but this is done simply to illustrate the fact that different rectifiers can be used in both Fig. 1 and Fig. 2, whose requirements are the same. Likewise, while switch point is shown as connected through lead to the input coil of the discriminator, it will be apparent that this likewise is illustrative and not restrictive. The operation of the Fig. 2 circuit is substantially the same as that previously given for Fig. 1. Since leads and draw no current, this arrangement does not affect the operation of the main television circuit. It has been pointed out that with the circuit heretofore described, when a tuning indicator employing a tuning eye tube is used, it will operate in reverse fashion, since the control potential from the indicator circuit is positive. While this arrangement will operate satisfactorily, there is some advantage in having the tube operate in conventional fashion. This may be accomplished by modifying the control circuit to provide a negative control potential; and one arrangement of this type is illustrated in Fig. 4. It includes separate circuits for the visual indicator and for the sound indicating arrangement including tube both connected to the same pickup through switch arm The sound circuit is the same as that previously described, including rectifier filter and resistor connected as in Figs. 1 and 2. A separate visual indicator circuit is also connected to switch arm and includes a second rectifier connected with its positive side toward arm and the input, so that the negative side is connected through filter which may be the same as filter to the visual tuning indicator where it controls the operation of the tuning eye tube in conventional manner. The same D.C. potential may also be used for automatic gain control of the I. F. amplifier. Lead connected to the output of filter conducts the negative control potential to the I. F. amplifier grids in the conventional manner. The control voltage does not vary appreciably with changes in picture content because the diode operates on synchronizing pulses, as would a peak voltmeter. As already indicated, the invention is advantageous for television receivers employing a tuned radio frequency intercarrier amplification section. This embodiment is illustrated in Fig. 5. Parts common to Figs. 1 and 5 are designated by the same numerals, and as the portions of the circuits of these figures following line — are the same, this portion is not included in Fig. 5. The circuit of the amplifier is well known, being shown in standard publications and therefore is not illustrated in detail. The last amplifier stage includes the usual output transformer with primary shunted by tuning condenser and trimming condenser and secondary connected to the detector tube and shunted by tuning condenser and trimming condenser All of these condensers are of course variable; and the tuning condensers are ganged with other tuning condensers in amplifier in accordance with standard practice. The indicator circuit input coil is inductively coupled to primary coil and the variable condenser which tunes coil is ganged with condensers and Coil and condenser, are designed and arranged to maintain a substantially uniform difference of 2 megacycles between the frequencies to which coils and are tuned, throughout the tuning range. This is due to the vestigial system of transmission of television signals, which places the picture carrier about 2 mc. away from the middle of the band. It has been found in practice that the frequencies to which these coils are tuned do not vary during tuning at precisely the same rate, so that the frequency difference will vary slightly at different points in the tuning range. It has been found that by adjusting the inductance of coil and the capacity of its trimmer condenser the desired difference can be obtained at the upper and lower limits of said range, and the variations at intermediate frequencies will be negligible. The operation of this embodiment is apparent from from the foregoing description. While the invention has particular value when applied to television receivers, especially those using the intercarrier system, it is also applicable to other circuits which present a similar problem of obtaining precise tuning when the tuned circuits have a relatively broad pass band. This condition is present in receivers of frequency modulated valves, in which the pass band must be wide enough to pass the entire range of modulation frequencies without distortion. Such receivers require care and accurate aural judgment in order to tune them correctly to a setting at which neither the highest nor the lowest modulation frequencies are distorted. The present invention substitutes simple judgment of sound volume, of the visual indicator position, or of both, for judgment of slight changes in sound quality. A circuit of this type is shown diagrammatically in Fig. 6, which illustrates an FM receiver having the usual front end and I. F. amplifier since superheterodyne amplification is generally used in such receivers. Amplifier terminates in the primary of a discriminator, which is inductively coupled to the indicator circuit input coil tuned by condenser and connected to rectifier Since the latter parts and the remaining elements of the circuit have the same arrangement and functions as similar parts and elements in the indicator system operated by the audio circuit as shown in Fig. 1 and described above, they are designated by the same numerals, and further description of the operation of this embodiment is not necessary. Coil is tuned to the intermediate frequency in amplifier and when the front end is accurately tuned to the desired carrier wave length, so that the entire range of modulation frequencies is passed without distortion, that fact will be clearly indicated by sound volume and by indicator position, as already noted. For simplicity, only the inductive type of input coupling of the indicator circuit has been shown in Figs. 5 and 6; but this showing is not intended to be construed as a limitation to this type of coupling, especially since the conductive type has been illustrated in Fig. 2. It is also evident that the modification shown in Fig. 4 is applicable to Figs. 5 and 6. While a specific embodiment of the invention and certain variations have been described, it will be evident that the invention is not limited to the particular arrangements shown. It can be applied by electronic engineers in the light of this disclosure to a wide variety of circuits, and particularly television circuits, that have been and will be hereafter disclosed. While it has special and unexpected advantages when used with the intercarrier circuit, it includes features that are applicable to other circuits. Although its use with the vestigial side band system has been described, since it conforms to present preferred practice, and is particularly advantageous for this system, the invention in its broader aspects is not limited to such use. Likewise, the invention is not limited to circuits employing a discriminator. The specific disclosure therefore is not intended to limit the invention to the particular embodiments described, except as indicated in the claims. I claim: 1. A television receiver of the vestigial side band type for receiving a video modulated carrier having a portion of one video side band removed and having a frequency modulated audio channel operating just beyond the limit of the other video side band, comprising in combination, tunable means for receiving the modulated radio waves and producing a radio frequency signal having a band of modulations thereon conforming substantially to those on the received waves, a detector for rectifying the output of said means, means responsive to the video signals existing in the output of said detector for displaying a picture, a selector connected to the output of said detector for selecting the frequency modulated audio signals, a frequency discriminator fed by the output of said selector, an audio amplifier fed by said frequency discriminator, selective means connected to said first-named means and sharply peaked as compared to the band width of the video modulated signals, said selective means being peaked at a frequency within the band of the video signals near the end thereof opposite that which carries the audio modulation, and tuning indicator means responsive to the output of said selective means for increasing the gain of said audio amplifier to increase the output thereof when said selective means is fed with signals at its resonant frequency. 2. A television receiver as defined in claim 1, in which said tunable means and said selective means are inductively coupled to each other. 3. A television receiver of the vestigial side band type for receiving a video modulated carrier having a portion of one video side band removed and having a frequency modulated audio channel operating just beyond the other video side band, comprising in combination, means tunable over a range of frequencies inclusive of those of the signals to be received for producing a radio frequency signal having a band of modulations thereon conforming substantially to those on said received waves, said means including an element for passing said radio frequency signals, said element having at its upper end an acceptance curve which includes a small portion of said first side band and which is rising as it crosses from the last-named to the remaining side band, said acceptance curve including at its other end the frequency modulated audio signal modulations, a detector for detecting the output of said element, means amplifying the detected output and utilizing it for producing a picture, a selector for extracting the frequency modulated audio signals from the detected energy, selective means peaked to a frequency on the said rising portion of said curve, the selective means being sharply peaked as compared to the width of the video modulations and being connected to the first-named means and energized by said radio frequency signal, and means energized by said selective means for producing a signal indicative of the tuning adjustment of said receiver and useful to effect accurate tuning thereof to a received signal. 4. A television receiver as defined in claim 3, in which said tunable means is a tuned radio frequency amplifier producing said radio frequency signal in its output, said tunable means having a variable tuning member, said selective means comprising a tuned resonant circuit having a variable tuning member ganged with the first-named tuning member in such relation that the frequency of the selective means remains on the said rising portion of the acceptance curve of the tunable means. 5. A television receiver as defined by claim 3, in which said tunable means is a radio receiver of the superheterodyne type, said element being a part of an intermediate frequency amplifier stage, said selective means being connected to an intermediate frequency amplifier and being responsive to the modulated intermediate frequency signal. 6. A television receiver as defined by claim 5 in which said means controlled energized by said selective means comprises all of the following parts: an audio amplifier coupled to the output of said selector and including a control grid for controlling the gain, a tuning eye, a first series circuit including a rectifier and filter for connecting the output of said selective means to said grid, and a second series circuit including a rectifier and filter for connecting the output of said selective means to said tuning eye. 7. In a television receiver, signal producing means comprising an input circuit for passing a band of frequencies wide enough to include both the video and sound modulations, said circuit including tuning means for varying the frequency of reception, and a detector coupled to the output of said circuit; means coupled to the output of said detector for producing a picture conforming to the video modulation detected; means for separating the audio modulations in the output of said detector and for amplifying the same; an electron discharge device having a grid; means connecting said grid to said input circuit; a tuned circuit in the output circuit of said discharge device; said tuned circuit being tuned to a frequency within said band and being sharply peaked as compared to the width of said band, and tuning indicating means responsive to the potential across said tuned circuit for effecting an indication useful in tuning the receiver which varies with said potential. 8. A television receiver as defined in claim 7 in which the tuning indicating means includes means for increasing the degree of amplification of the audio modulation as the signals reaching said tuned circuit approach its resonant frequency. 9. In a television receiver of the tuned radio frequency type, an input circuit for producing in its output a band of frequencies with the carrier frequency closely adjacent one end of the band and including tuning means for varying the frequency of reception, the tuning means having a mechanically variable element operable to control the frequency of reception; audio means for extracting from said band of frequencies any audio modulation existing in said band adjacent the other end thereof, means for extracting from said band of frequencies any video modulations, selective means peaked in said band for developing a signal depending on the amplitude of the signals in said band, said selective means including a tuned resonant circuit having a mechanically variable clement for adjusting the frequency thereof, and means ganging said mechanically variable elements together in such relation that the tuned resonant circuit is tuned to said carrier frequency in said band when the tuning means is adjusted to allow the whole band to readily pass, tuning indicator means, and control means responsive to said selective means for controlling the degree of indication given by said tuning indicator means in response to variations in the output of said selective means. 10. A television receiver as defined in claim 9 in which said indicating means is a loudspeaker, said control means including means for increasing the amplitude of the signal output of the audio means when the output of the selective means increases. 11. A television receiver as defined in claim 9 in which said indicating means is a tuning indicator connected to the output of said selective means. 12. In a television receiver, an input circuit for producing in its output a limited band of frequencies and including tuning means for varying the frequency of reception, audio means for extracting from said band of frequencies any audio modulation existing in said band adjacent one end thereof, and means including a tuned circuit sharply peaked at a frequency in said band adjacent the other end thereof for increasing the amplitude of the output of said audio means when the current in the sharply tuned circuit increases. 13. A radio receiver for receiving a wave which has a carrier having a wide band of modulations on it together with an additional audio modulated signal the frequency of which varies within limits outside of said wide band, comprising in combination, tunable input means for producing in its output a radio frequency signal having both of said modulations on it, a detector for rectifying the output of said input means, a selector for passing said additional modulations, an amplifier for amplifying the output of said selector, selective means sharply peaked as compared to the width of said wide band and connected to said input means, said input means having an acceptance band just broad enough to include both of said modulations and the selective means being peaked to a frequency corresponding to the carrier frequency of said radio frequency signal when the tunable means is tuned to optimum position, and tuning indicating means controlled by said selective means for increasing the gain of said amplifier with increase in the output of said selective means. 14. In a television receiver for a television system in which a picture signal carrier is amplitude modulated and the complemental sound signal is transmitted as a frequency modulation of a second carrier, in combination, an amplifier, means for supplying said picture and sound carriers of a television signal to said amplifier, a detector supplied by said amplifier, and a selecting circuit connected between said amplifier and said detector, and having a frequency characteristic such that both picture and sound carriers are passed to said detector the two carriers being heterodyned with each other in the detector, means in the selecting circuit for modifying the characteristics of that circuit so that it is characterized by substantially zero slope over the range of frequency swing of the sound carrier and has an amplitude level below the minimum modulated amplitude of the amplitude-modulated picture signal carrier, whereby the output from said detector contains both detected video signals and undetected frequency modulated audio signals, and a detector responsive to the undetected signals to produce the audio signals, resonant means connected to said amplifier and peaked sharply to the picture signal carrier frequency in the output of said amplifier, and means for indicating the amplitude of the current flow in said resonant means. 15. In a television receiver for receiving a television signal band consisting of an amplitude modulated video signal carrier and a related frequency modulated audio signal carrier, the two carriers being separated by a substantially fixed frequency difference, in combination, a selecting circuit adapted to be supplied with said signal carriers, said selecting circuit including means to cause the circuit characteristic to be such that the picture and the sound carriers of the same television signal band, as accepted, are amplified in an amplitude ratio of the order of 20:1, with substantially zero amplitude change of the audio carrier with frequency change, means for heterodyning and detecting said carriers to produce both a detected video signal and an undetected frequency modulated audio carrier, resonant means peaked sharply to the picture carrier frequency appearing in the output of said selecting means, and means for detecting and amplifying the said undetected frequency modulated audio carrier, the last-named means including means for increasing its gain when the output of said resonant means increases. 16. A television receiver for receiving a television signal band including an amplitude modulated image carrier and a related frequency modulated sound carrier spaced a substantially fixed frequency from the picture carrier, said receiver comprising means to select and amplify one such band of frequencies so that the amplitude of the sound carrier will be less than the amplitude of the image carriers at the maximum modulation of that carrier by the picture or image signal, means for heterodyning said carriers to produce a new carrier having a frequency equal to the frequency spacing of the image and sound carriers and for amplitude detecting the image carrier to produce image signals, demodulating means energized in accordance with the new carrier for producing audio signals, a tuning eye, resonant means peaked to the image carrier appearing in the output of the first-named means and connected to such output, and a rectifier connecting said resonant means to the tuning eye. 17. A radio receiver for receiving a wave which has a carrier having a wide band of modulations on it together with an additional audio modulated signal the frequency of which varies within limits outside of said wide band, comprising in combination, tunable input means for producing in its output a radio frequency signal having both of said modulations on it, a detector for rectifying the output of said input means, a selector for passing said additional modulations, audio means responsive to the output of said selector, selective means sharply peaked as compared with the width of said wide band and connected to said input means, said input means having an acceptance band broad enough to include both of said modulations and the selective means being peaked to a frequency corresponding to the carrier frequency of said radio frequency signal when the tuning means is tuned to optimum position, and means controlled by said selective means for effecting an indication when the selective means is being fed with signals whose frequency corresponds to the resonant frequency of the selective means. 18. A radio receiver as defined in claim 17 in which the last-named means is a visual indicator separate from the audio means. 19. A radio receiver as defined in claim 17 in which the audio means comprises an audio amplifier and a loudspeaker fed thereby, the means for effecting an indication including means for controlling the gain of said audio amplifier. 2,023,458 Yolles _____________ Dec. 10, 1935 2,100,236 Brown _____________ Nov. 23, 1937 2,153,783 Weyers _____________ Apr. 11, 1939 2,160,566 Schmidt _____________ May 30, 1939 2,173,173 Lewis ________________ Sept. 19, 1939 2,189,300 Roberts ______________ Feb. 6, 1940 2,190,435 Roberts ______________ Feb. 13, 1940 2,221,096 Keall ________________ Nov. 12, 1940 2,261,643 Brown ________________ Nov. 4, 1941 2,264,019 Case _________________ Nov. 25, 1941 2,285,857 Hewel ________________ June 9, 1942 2,355,701 Bradley ______________ Aug. 15, 1944 2,451,584 Stone ________________ Oct. 19, 1948 2,501,416 Smith ________________ Mar. 21, 1950 2,528,222 Foster _______________ Oct. 31, 1950 2,632,800 Schlesinger __________ Mar. 24, 1953 358,271 Italy ________________ Apr. 11, 1938
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As to amendments affecting the disclosure, the scope of any claim or that add a claim, the remarks accompanying the amendment must fully and clearly state the reasons on which reliance is placed to show: (1) why the amendment is needed; (2) why the proposed amended or new claims require no additional search or examination and (3) why the claims are patentable."