MLC INTELLECTUAL PROPERTY , LLC (ASSIGNEE) et al.Download PDFPatent Trials and Appeals BoardNov 2, 20202020005915 (P.T.A.B. Nov. 2, 2020) Copy Citation UNITED STATES PATENT AND TRADEMARK OFFICE UNITED STATES DEPARTMENT OF COMMERCE United States Patent and Trademark Office Address: COMMISSIONER FOR PATENTS P.O. Box 1450 Alexandria, Virginia 22313-1450 www.uspto.gov APPLICATION NO. FILING DATE FIRST NAMED INVENTOR ATTORNEY DOCKET NO. CONFIRMATION NO. 90/014,245 12/18/2018 5764571 4293 37086 7590 11/02/2020 POLSINELLI PC (NDQ REEXAMINATION GROUP) 1000 LOUISIANA STREET Suite 6400 HOUSTON, TX 77002 EXAMINER LEE, CHRISTOPHER E ART UNIT PAPER NUMBER 3992 MAIL DATE DELIVERY MODE 11/02/2020 PAPER Please find below and/or attached an Office communication concerning this application or proceeding. The time period for reply, if any, is set in the attached communication. PTOL-90A (Rev. 04/07) UNITED STATES PATENT AND TRADEMARK OFFICE ____________ BEFORE THE PATENT TRIAL AND APPEAL BOARD ____________ Ex parte MLC INTELLECTUAL PROPERTY, LLC Patent Owner and Appellant ____________ Appeal 2020-005915 Reexamination Control 90/014,245 United States Patent 5,764,571 Technology Center 3900 ____________ Before ALLEN R. MacDONALD, JOHN A. JEFFERY, and KEVIN F. TURNER, Administrative Patent Judges. JEFFERY, Administrative Patent Judge. DECISION ON APPEAL Appellant1 appeals under 35 U.S.C. §§ 134 and 306 the Examiner’s decision to reject claims 1, 9, 30, 42, and 45. We have jurisdiction under 35 U.S.C. §§ 134 and 306, and we heard the appeal on October 26, 2020. We AFFIRM. 1 We use the word “Appellant” to refer to “applicant” as defined in 37 C.F.R. § 1.42. Appellant identifies the real party in interest as MLC Intellectual Property, LLC. Appeal Br. 1. Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 2 STATEMENT OF THE CASE This proceeding arose from a request for ex parte reexamination filed on December 18, 2018 of United States Patent 5,764,571 (“the ’571 patent”), issued to Gerald J. Banks on June 9, 1998. The ’571 patent describes an electrically-alterable, non-volatile multi- bit memory cell with predetermined memory states. The cell’s programming is verified by (1) selecting a reference signal corresponding to information to be stored, and (2) comparing a cell signal with the selected reference signal. See Abstract. Claim 1 is illustrative of the invention and is reproduced below: 1. A multi-level memory device comprising: an electrically alterable non-volatile multi-level memory cell for storing input information in a corresponding one of Kn predetermined memory states of said multi- level memory cell, where K is a base of a predetermined number system, n is a number of bits stored per cell, and Kn >2; memory cell programming means for programming said multi- level memory cell in accordance with said input information; reference voltage selecting means for selecting one of a plurality of reference voltages in accordance with said input information, each of said reference voltages corresponding to a different one of said predetermined memory states; and comparator means for comparing a voltage of said multi-level memory cell with the selected reference voltage, said comparator means further generating a control signal indicating whether the state of said multi-level memory cell is the state corresponding to said input information. Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 3 RELATED PROCEEDINGS This appeal is said to be related to various pending proceedings. First, Appellant informs us of related copending litigation, namely MLC Intellectual Property, LLC v. Micron Technology, Inc., No. 3:14-cv-03657 (N.D. Cal. Aug. 12, 2014). Appeal Br. 1.2 Appellant also informs us that the ’571 patent was the subject of two inter partes review (IPR) proceedings, IPR2015-00504 and IPR2015-00517, where the Board denied institution in both proceedings. Id. Appellant adds that the ’571 patent is also the subject of two ex parte reexamination proceedings, control numbers 90/020,112 and 90/014,421, where the former confirmed the claims’ patentability over the combination of Kitamura (cited in full below) and Connolly, the latter reference not at issue here. See id.; see also Ans. 6. Although the ’421 reexamination proceeding is still pending, it is directed to claims 15–17 of the ’571 patent that are not at issue here. See Appeal Br. 1. THE REJECTION The Examiner rejected claims 1, 9, 12, 30, 42, and 45 under 35 U.S.C. § 103 as unpatentable over Kitamura (JP60-175105 A; published Feb. 14, 1987) and Noguchi (US 5,262,984; issued Nov. 16, 1993). Final Act. 6–16. 2 Throughout this opinion, we refer to (1) the Final Rejection mailed January 14, 2020 (“Final Act.”); (2) the Appeal Brief filed March 23, 2020 (“Appeal Br.”); (3) the Examiner’s Answer mailed June 12, 2020 (“Ans.”); and (4) the Reply Brief filed August 12, 2020 (“Reply Br.”). Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 4 CONTENTIONS, FINDINGS, AND CONCLUSIONS The Examiner finds that Kitamura’s multi-level memory device includes, among other things, a reference voltage converter for generating one of plural reference voltages, namely threshold voltages VT, according to input information, namely digital signals B1 and B2. Final Act. 6–8. Although the Examiner acknowledges that Kitamura’s converter does not select a reference voltage according to the input information, the Examiner cites Noguchi for teaching this feature in concluding that the claim would have been obvious. Final Act. 8. According to the Examiner, substituting Noguchi’s input data changeover circuit 40 and constant voltage changeover circuit 44 in Figure 12, which the Examiner maps collectively to the recited reference voltage selecting means, for Noguchi’s digital-to-analog (D/A) conversion circuit 10 in Figure 1 would have been a simple substitution to obtain predictable results. Id. This substitution is said to provide more versatility than Kitamura’s D/A converter by enabling analog output voltage levels to be set independently to best suit the memory cell’s characteristics. Id. Appellant argues that the Examiner not only contradicts the Board’s earlier determinations, the Examiner’s proposed replacement of Kitamura’s D/A converter with Noguchi’s multiplexer is based solely on impermissible hindsight, and there is no reason to combine the references as the Examiner proposes. Appeal Br. 7–27; Reply Br. 9–13. Appellant adds that the Examiner’s proposed substitution not only changes Kitamura’s principle of operation from two-way uniform conversion to non-uniform selection and conversion, the proposed substitution renders Kitamura inoperable for its Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 5 intended purpose by, among other things, eliminating shared circuitry needed to maintain the operating margin between verification and testing. Appeal Br. 18–31; Reply Br. 1–9. Because claims 9, 12, 30, 42, and 45 are not argued separately with particularity (see generally Appeal Br.; Reply Br.), we determine this appeal on the basis of claim 1. ISSUE Under § 103, has the Examiner erred in rejecting claim 1 by finding that Kitamura and Noguchi collectively would have taught or suggested a reference voltage selecting means for selecting one of plural reference voltages in accordance with stored input information? This issue turns on whether substituting Noguchi’s input data changeover circuit and constant voltage changeover circuit for Kitamura’s D/A conversion circuit as the Examiner proposes renders Kitamura unsuitable for its intended purpose. ANALYSIS We begin by noting that because the ’571 patent expired, we construe the claims under the standard set forth in Phillips v. AWH Corp., 415 F.3d 1303 (Fed. Cir. 2005) (en banc). See In re Rambus, Inc., 753 F.3d 1253, 1256 (Fed. Cir. 2014). Accord Final Act. 2 (construing the claims under the Phillips standard given the ’571 patent’s expiration). Under the Phillips standard, claim terms are generally given their ordinary and customary meaning, namely the meaning the term would have to an ordinarily skilled artisan at the time of the invention. Phillips, 415 F.3d at 1312. In construing the claim, we begin with the intrinsic evidence Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 6 of record, namely the claim language, the patent specification, and, if in evidence, the prosecution history. See id. at 1313. Turning to claim 1, the claim recites, in pertinent part, reference voltage selecting means for selecting one of plural reference voltages in accordance with input information, each reference voltage corresponding to a different one of the multi-level memory cell’s predetermined memory states (“the reference voltage selecting means limitation”). Under § 112, sixth paragraph, this means-plus-function limitation is construed in light of the corresponding structure in the Specification and its equivalents. See In re Donaldson Co., Inc., 16 F.3d 1189, 1193 (Fed. Cir. 1994) (en banc). Accord Final Act. 5 (construing the reference voltage selecting means limitation under § 112, sixth paragraph); MLC Intellectual Property, LLC v. Micron Technology, Inc., No. 14-cv-03657-SI, 2016 WL 6563343, at *3–4 (N.D. Cal. 2016) (unpublished) (noting the parties’ agreement that the reference voltage selecting means limitation is a means-plus-function limitation construed under § 112, sixth paragraph). It is undisputed that the verify reference voltage select circuit 222 in the ’571 patent’s Figure 8 is the structure corresponding to the recited reference voltage selecting means. See Final Act. 6; Appeal Br. 3 (referring to verify reference voltage select circuit 222 as a selecting device for selecting a verify reference voltage or signal); Micron Tech., Inc. v. MLC Intellectual Property, LLC, IPR2015-00504, IPR2015-00517, Paper 8 at 6–7 (PTAB July 20, 2015) (“IPR Dec.”) (noting that the verify reference voltage select circuit 222 is the structure corresponding to the reference voltage selecting means limitation). Accord Micron Tech., Inc. v. MLC Intellectual Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 7 Property, LLC, No. 14-cv-03657-SI, 2018 WL 4616255 (N.D. Cal. 2018) (unpublished), at *3–5 (articulating a similar construction). Turning to the rejection, the Examiner acknowledges that Kitamura does not disclose the recited reference voltage selecting means for selecting one of plural reference voltages, but rather discloses a reference voltage converter for converting one of plural reference voltages, namely D/A conversion circuit 10 in Figure 1. See Final Act. 7–8. The Examiner, however, concludes that substituting Noguchi’s input data changeover circuit 40 and constant voltage changeover circuit 44 in Figure 12, which the Examiner maps collectively to the recited reference voltage selecting means, for Noguchi’s D/A conversion circuit, would have been a simple substitution to obtain predictable results. Final Act. 8. On this record, we see no error in the Examiner’s proposed combination. First, the Examiner’s findings and conclusions do not conflict with those of the Board in the related IPR proceedings, despite Appellant’s arguments to the contrary. See Appeal Br. 10–11. As the Examiner indicates (Ans. 6–7, 10–11), the Board did not consider the Kitamura/Noguchi combination at issue here, but rather considered whether the Petitioner was reasonably likely to prevail in showing that at least one of the challenged claims was unpatentable as obvious over either the Kitamura or Mehrotra references, the latter not at issue here. See IPR Dec. 3–15. Although the Board concluded that the Petitioner was not reasonably likely to prevail in showing that the claimed invention would have been obvious based on Kitamura (or Mehrotra) alone, Noguchi was simply not at issue in the IPR proceeding, let alone the proposed Kitamura/Noguchi combination Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 8 at issue here. Accord Declaration of David Kuan-Yu Liu, dated Dec. 17, 2018 (“Liu Decl.”) ¶ 53 (noting that the obviousness grounds in the IPR petitions each involved obviousness over a single reference). Appellant’s contention, then, that the Board ostensibly already considered and rejected the argument that Kitamura and Noguchi allegedly perform the same function (Appeal Br. 23) is, at best, overstated since Noguchi was not before the Board in the related IPR proceedings. In the related IPR proceedings, the Board found that Kitamura does not disclose the D/A conversion circuit’s specific functioning, let alone selecting between reference voltages or signals. See IPR Dec. 10. In reaching its conclusion, the Board noted that a D/A converter’s normal function is not selecting between reference voltages, but rather rendering digital input into analog form. Id. The Board added that the Petitions in those proceedings provided no rationale why Kitamura’s disclosure of D/A conversion renders selecting a reference voltage or signal obvious. Id. Our emphasis underscores that the Board’s findings and conclusions in this regard were based solely on Kitamura—not Kitamura combined with other references, let alone Noguchi, as is the case here. Nevertheless, the Examiner’s findings regarding Kitamura reasonably comport with those of the Board in the related IPR proceedings, namely that Kitamura does not disclose the recited reference voltage selecting means for selecting one of plural reference voltages, but rather discloses a reference voltage converter for converting one of plural reference voltages, namely D/A conversion circuit 10 in Figure 1. See Final Act. 7–8; Ans. 2 (noting that Kitamura Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 9 discloses every recited element except for the reference voltage selecting means). Notably, the Examiner’s obviousness rejection is not based on Kitamura alone as in the related IPR proceedings, but rather Kitamura and Noguchi collectively. Moreover, the Examiner articulates why it would have been obvious for an ordinarily skilled artisan3 to select reference voltages in Kitamura in light of Noguchi, namely to provide more versatility to Kitamura’s D/A conversion circuit by enabling independently setting output voltages to best suit the memory cell’s characteristics. See Final Act. 8; Ans. 3–5, 8–9, 21, 40. Accord Liu Decl. ¶ 79 (noting that Noguchi’s approach in Figure 12 would provide more versatility than a typical D/A converter because Noguchi’s constant voltage circuits independently generate their respective constant voltages, thus allowing the system designer to set voltage levels independently for each input bit combination to 3 Both Dr. Lee and Dr. Liu describe the level of ordinary skill in the pertinent art similarly. See Declaration of Dr. Jack Lee, dated Apr. 26, 2019 (“Lee Decl.”) ¶ 11; see also Declaration of David Kuan-Yu Liu, dated Dec. 17, 2018 (“Liu Decl.”) ¶ 12; Supplemental Declaration of David Kuan-Yu Liu, dated May 31, 2019 (“Supp. Liu Decl.”) ¶ 8. Therefore, we find, as did the court in a related proceeding, that one of ordinary skill in the art at the time of the invention would have (1) an undergraduate degree in electrical engineering (or equivalent subject), along with three to four years of post- graduate experience designing semiconductor and memory devices, or (2) a master’s degree in electrical engineering (or equivalent subject) together with one or two years of post-graduate experience designing semiconductor and memory devices. Accord MLC Intellectual Property, LLC v. Micron Technology, Inc., No. 3:14-cv-03657-SI, 2016 WL 6563343 (N.D. Cal. Nov. 4, 2016), at *2–3 (adopting this skill level). Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 10 best suit memory cell characteristics); Supp. Liu Decl. ¶ 24 (reiterating Noguchi’s more versatile approach).4 On this record, we see no error in Examiner’s conclusion. As shown in Noguchi’s Figure 12, reproduced below, input buffers for binary data D0 and D1 are connected to input data changeover circuit 40 that is connected to constant voltage changeover circuit 44. See Noguchi, col. 10, ll. 3–58. Noguchi’s input data and constant voltage changeover circuits in Figure 12 As noted previously, the Examiner maps Noguchi’s input data and constant voltage changeover circuits 40 and 44 collectively to the recited 4 Although Dr. Liu’s declarations also discuss the Briner reference that is not at issue here, Dr. Liu’s discussion regarding Kitamura, Noguchi, and their combinability is nonetheless pertinent to the obviousness rejection before us. Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 11 reference voltage selecting means. See Final Act. 8; Ans. 4, 7, 9, 14–15, 18– 19, 28. We see no error in this mapping. As Dr. Liu explains, Noguchi’s input data and constant voltage changeover circuits 40 and 44 collectively perform the same overall function as a 2-bit D/A converter by (1) receiving a 2-bit input (D0 and D1), and (2) outputting one of four constant analog voltages corresponding to the input by selecting that voltage—functionality commensurate with that of an analog multiplexer. See Liu Decl. ¶¶ 78–87. Accord Ans. 16 (referring to Dr. Liu’s testimony in this regard). Given Noguchi’s D/A conversion and voltage selection functionality, we see no error in the Examiner’s conclusion that providing such selection functionality in addition to D/A conversion under Examiner’s proposed combination would have been at least an obvious variation yielding a predictable result. Such an enhancement uses prior art elements predictably according to their established functions—an obvious improvement. See KSR Int’l Co. v. Teleflex, Inc., 550 U.S. 398, 417 (2007). Appellant’s contention that Noguchi’s constant voltage changeover circuit is not a D/A converter because the digital input and analog outputs ostensibly have no relationship is unavailing. See Appeal Br. 12 (citing Declaration of Jerry Banks Pursuant to 37 CFR 1.132, dated Nov. 7, 2019 (“Banks Decl.”) ¶ 19). Although we appreciate Mr. Banks’ insights in this regard, the fact that he is an interested party, namely the inventor, in this proceeding reduces the probative value of his declaration, at least with respect to his views regarding patentability of his invention over the cited prior art. See Ashland Oil, Inc. v. Delta Resins & Refractories, Inc., 776 Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 12 F.2d 281, 294 (Fed. Cir. 1985) (noting that an expert’s interest in the outcome of the case is a factor in assessing the probative value of an expert opinion). Moreover, Mr. Bank’s averments regarding Noguchi’s alleged lack of a D/A converter are undercut by Dr. Liu’s averments to the contrary. See Liu Decl. ¶ 78 (noting that Noguchi’s input data and constant voltage changeover circuits 40 and 44 collectively perform the same overall function as a 2-bit D/A converter). Therefore, to the extent that Appellant contends that the proposed combination somehow eliminates D/A conversion, we disagree given Noguchi’s D/A conversion and selection functionality noted above. Accord Ans. 16 (noting this dual functionality). Nor are we persuaded that combining the teachings of Noguchi with those of Kitamura as the Examiner proposes would render Kitamura inoperable or unsuitable for its intended purpose as Appellant contends. See Appeal Br. 27–30; Reply Br. 4–9. As Dr. Liu explains, Noguchi’s circuits 40 and 44 collectively achieve the same result and conversion function, namely converting digital input to analog output, as Kitamura’s D/A conversion circuit 10. Supp. Liu Decl. ¶ 23. Therefore, using Noguchi’s circuits 40 and 44 in place of Kitamura’s D/A conversion circuit 10 would simply use Noguchi’s 4-input analog multiplexer structure to perform in the same predictable manner that the 4-input multiplexer performs in Noguchi as Dr. Liu indicates. Id. Notably, as Dr. Liu explains in paragraph 26 of his supplemental declaration, the Kitamura/Noguchi combination does not alter Kitamura’s programming verification and overall memory cell programming technique. With the proposed combination, Kitamura’s comparator 9 still uses the Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 13 output of the modified D/A conversion circuit in the same manner Kitamura discloses. See Supp. Liu Decl. ¶ 26. In short, differences in the way Kitamura uses the output of D/A conversion circuit 10 and the way Noguchi uses the output of circuit 44 do not make Noguchi’s conversion technique any less applicable to Kitamura. Id. Although Kitamura and Noguchi use the outputs of their conversions differently, ordinarily skilled artisans would nonetheless recognize the conversions themselves are commensurate, and that Noguchi’s circuits 40 and 44 could be used to perform Kitamura’s conversion as Dr. Liu indicates. Id. ¶ 38. Such an enhancement uses prior art elements predictably according to their established functions—an obvious improvement. See KSR, 550 U.S. at 417. So even assuming, without deciding, that Noguchi’s constant voltage changeover circuit is not used for verification as Appellant contends (Appeal Br. 20–21) and Dr. Lee avers in paragraph 85 of his declaration,5 the fact that Noguchi’s conversion output is not used for this particular purpose does not mean that Noguchi’s converter cannot be used for another purpose, such as that in Kitamura as the Examiner proposes. Nor has Appellant shown persuasively that the cited references criticize, discredit, or otherwise discourage the Examiner’s proposed combination to teach away from that approach. See Norgren Inc. v. Int’l Trade Comm’n, 699 F.3d 1317, 1326 (Fed. Cir. 2012); see also In re Kahn, 441 F.3d 977, 990 (Fed. Cir. 2006). Appellant’s contention that replacing Kitamura’s D/A conversion circuit 10 with that shown in Noguchi’s Figure 12 would break the uniformity of characteristics of Kitamura’s D/A and A/D conversion circuits 5 Declaration of Dr. Jack Lee, dated Apr. 26, 2019 (“Lee Decl.”) ¶ 85. Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 14 provided by sharing a voltage dividing element and reference voltage supply (Appeal Br. 27–28) is unavailing. To be sure, Kitamura’s D/A and A/D conversion circuits 10 and 13 preferably share a voltage dividing element and reference voltage supply to make their characteristics uniform. Kitamura ¶ 11. Our emphasis on the term “preferably” underscores that sharing these elements to achieve uniformity is merely a preference—not a requirement—as Dr. Liu indicates. See Supp. Liu Decl. ¶ 32. Accord Ans. 23 (noting this preference). Although Kitamura’s particular shared arrangement may be preferred to achieve uniformity, ordinarily skilled artisans would nevertheless infer from Kitamura’s articulation that there may be other ways to achieve uniformity as the Examiner indicates (Ans. 23)— albeit less preferred. For example, Dr. Liu explains that, under the proposed combination, uniformity between Kitamura’s circuits 10 and 13 can be achieved by sharing a reference voltage supply, namely by replacing Kitamura’s single reference voltage supply and voltage dividing element with four separate reference voltage supply circuits. Supp. Liu Decl. ¶ 33. On this record, we see no reason why these four reference voltage supplies under the proposed combination could not be shared to achieve uniformity as Dr. Liu indicates. See id. Sharing these voltage supplies to achieve uniformity is not only reasonably consistent with Kitamura’s teachings, there is no persuasive evidence on this record to rebut this finding. We reach this conclusion despite Dr. Lee’s view that replacing Kitamura’s D/A conversion circuit 10 with Noguchi’s Figure 12 would break uniformity, and that the proposed combination would likely render Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 15 Kitamura inoperable for its intended purpose. See Lee Decl. ¶ 84. Leaving aside Dr. Lee’s speculative term “likely” in connection with Kitamura’s alleged inoperability under the proposed combination, Dr. Lee’s averments are undercut by those of Dr. Liu as noted above. To the extent that Appellant contends that using shared voltage supplies under the Kitamura/Noguchi combination as Dr. Liu explains somehow eliminates shared circuity needed to maintain the operating margin between verification and testing (see Reply Br. 7–9), there is no persuasive evidence on this record to substantiate such a contention. Although we appreciate Mr. Banks’ insights in this regard in paragraphs 8 to 18 of his declaration, he is nonetheless an interested party, namely the inventor, in this proceeding—a fact that reduces the probative value of his declaration, at least with respect to his views regarding patentability of his invention over the cited prior art. See Ashland Oil, 776 F.2d at 294. Nevertheless, Mr. Banks’s averments do not squarely address the particular alternative noted above by Dr. Liu, namely using four shared reference voltage supplies under the Kitamura/Noguchi combination. To the extent that Appellant contends that this proposed modification somehow eliminates shared circuity needed to maintain the operating margin between verification and testing, there is no persuasive evidence on this record to substantiate such a contention. Lastly, we note that the propriety of the Examiner’s obviousness rejection is not based on whether Noguchi’s features can be bodily incorporated into Kitamura’s structure, but rather what the combined teachings of the references would have suggested to those of ordinary skill in the art. See In re Keller, 642 F.2d 413, 425 (CCPA 1981). Nor do Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 16 obviousness determinations based on teachings from multiple references require an actual, physical substitution of elements. In re Mouttet, 686 F.3d 1322, 1332 (Fed. Cir. 2012) (citations omitted). On this record, Appellant has not persuasively rebutted the Examiner’s proposed combination given the cited references’ collective teachings considered in light of the evidence of record. As noted previously, we find the proposed enhancement to Kitamura, namely providing both conversion and selection in light of Noguchi’s circuitry in Figure 12, would provide more versatility by enabling analog output voltage levels to be set independently to best suit the memory cell’s characteristics as the Examiner and Dr. Liu indicate. See Ans. 3–5, 8– 9, 21, 40; see also Supp. Liu Decl. ¶ 24. This proposed enhancement uses prior art elements predictably according to their established functions—an obvious improvement. See KSR, 550 U.S. at 417. Therefore, we are not persuaded that the Examiner erred in rejecting claim 1, and claims 9, 12, 30, 42, and 45 not argued separately with particularity. CONCLUSION The Examiner’s decision to reject claims 1, 9, 12, 30, 42, and 45 is affirmed. DECISION SUMMARY In summary: Claims Rejected 35 U.S.C. § Reference(s)/Basis Affirmed Reversed 1, 9, 30, 42, 45 103 Kitamura, Noguchi 1, 9, 30, 42, 45 Appeal 2020-005915 Reexamination Control 90/014,245 Patent US 5,764,571 17 REQUESTS FOR EXTENSIONS OF TIME Requests for extensions of time in this ex parte reexamination proceeding are governed by 37 C.F.R. § 1.550(c). See 37 C.F.R. § 41.50(f). AFFIRMED lv PATENT OWNER: POLSINELLI PC (NDQ REEXAMINATION GROUP) 1000 Louisiana Street Suite 6400 Houston, TX 77002 THIRD PARTY REQUESTER: SMITH BALUCH LLP 376 Boylston St Ste. 401 Boston, MA Copy with citationCopy as parenthetical citation