Ex Parte Agarwal et alDownload PDFPatent Trial and Appeal BoardSep 26, 201612910142 (P.T.A.B. Sep. 26, 2016) Copy Citation UNITED STA TES p A TENT AND TRADEMARK OFFICE APPLICATION NO. FILING DATE FIRST NAMED INVENTOR 12/910,142 10/22/2010 Parag Agarwal 104102 7590 09/26/2016 BrooksGroup 48685 Hayes Shelby Township, MI 48315 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 ATTORNEY DOCKET NO. CONFIRMATION NO. GP-309180-DIV-R&D-MJL 7430 EXAMINER ZIMMERMAN, JOHN J ART UNIT PAPER NUMBER 1784 MAILDATE DELIVERY MODE 09/26/2016 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 PARAG AGARWAL, ANIL K. SACHDEV, and SURESH SUNDARRAJ Appeal2014-008322 Application 12/910, 142 Technology Center 1700 Before MICHAEL P. COLAIANNI, JAMES C. HOUSEL, and CHRISTOPHER L. OGDEN, Administrative Patent Judges. HOUSEL, Administrative Patent Judge. DECISION ON APPEAL 1 Pursuant to 35 U.S.C. § 134(a), Appellants2 appeal from the Examiner's decision finally rejecting claims 1-8, 18-30, and 32-34. We have jurisdiction over the appeal under 35 U.S.C. § 6(b ). We AFFIRM. 1 Our decision refers to the Specification (Spec.) filed October 22, 2010, Appellants' Appeal Brief (Appeal Br.) filed February 28, 2014, the Examiner's Answer (Ans.) mailed May 30, 2014, and Appellants' Reply Brief (Reply Br.) filed July 29, 2014. 2 According to Appellants, the real party in interest is General Motors LLC. Appeal Br. 4. Appeal2014-008322 Application 12/910, 142 STATEMENT OF THE CASE The invention relates to an insert for damping vibration in a product in which it is cast. Spec. i-fi-13, and 32-33. Independent claim 1, reproduced below from the Claims Appendix to the Appeal Brief, is illustrative of the subject matter on appeal. Limitations at issue are italicized. 1. A product comprising an insert for a brake rotor compnsmg: a body portion comprising an annular portion comprising an inner edge and an outer edge, the inner edge and outer edge each having arc segments having a common center; a plurality of tabs extending radially from the body portion, wherein the tabs are tapered and the tabs being spaced apart from each other along the inner edge or outer edge so that a portion of the inner edge or outer edge between adjacent tabs is exposed; and wherein the insert is constructed and arranged to provide frictional damping of a brake rotor to extend radially beyond the brake rotor; and to reduce the total area of the insert exposed to an environment outside of the brake rotor in which the insert is placed. Rejections The Examiner maintains, and Appellants request our review of, the following grounds of rejection: 2 Appeal2014-008322 Application 12/910, 142 A. Claims 1-8, 33, and 34 under 35 U.S.C. § 112 (pre-AIA), second paragraph, as indefinite; B. Claims 1, 2, 4, 5, 7, and 29 underpre-AIA 35 U.S.C. § 102(e) anticipated by Miskinis;3 C. Claims 3, 6, 8, 18-20, 27, 28, 30, and 32-34 under pre-AIA 35 U.S.C. § 103(a) as unpatentable over Miskinis; D. Claims 3, 6, 8, and 18-28 under pre-AIA 35 U.S.C. § 103(a) as unpatentable over Miskinis in view of Hanna;4 E. Claims 1, 2, 4, 29, 30, and 32-34 under pre-AIA 35 U.S.C. § 102(a) anticipated by Chuo; 5 F. Claims 3 and 18-20 under pre-AIA 35 U.S.C. § 103(a) as unpatentable over Chuo; G. Claims 1-5, 21, 22, 29, 30, and 32-34 under pre-AIA 35 U.S.C. § 102(b) anticipated by McDowall; 6 H. Claims 6 and 18-20 under pre-AIA 35 U.S.C. § 103(a) as unpatentable over McDowall; I. Ciaims 1--4, 18----20, and 29 under pre-AIA 35 U.S.C. § 102(b) anticipated by Hendrickson; 7 J. Claims 1-5, 7, 8, 29, 30, and 32-34 under pre-AIA 35 U.S.C. § 102(b) anticipated by Stanley;8 and K. Claims 18-20 under pre-AIA 35 U.S.C. § 103(a) as unpatentable over Stanley. 3 Miskinis et al., US 2007/0235270 Al, published October 11, 2007. 4 Hanna et al., US 2007/0062768 Al, published March 22, 2007. 5 Chuo, US 2006/0264281 Al, published November 23, 2006. 6 McDowall, US 2,690,248, issued September 28, 1954. 7 Hendrickson, US 2, 508,065, issued May 16, 1950. 8 Stanley, US 2,062,480, issued December 1, 1936. 3 Appeal2014-008322 Application 12/910, 142 ANALYSIS We sustain each of the above rejections based on the findings of fact, conclusions of law, and rebuttals to arguments well expressed by the Examiner in the Answer. We adopt the Examiner's findings of fact as our own. The following comments are added for emphasis. Rejection A: § 112, 2nd paragraph Appellants do not argue the rejected claims separately. Therefore, we select claim 1 to decide this issue, and claims 2-8, 33, and 34 stand or fall with claim 1. The Examiner notes that claim 1 recites that the insert is "constructed and arranged to provide frictional damping of a brake rotor to extend radially beyond the brake rotor; and to reduce the total area of the insert exposed to an environment outside of the brake rotor in which the insert is placed.'' Ans. 2. The Examiner also notes that this claim recitation recites the construction and arrangement of the insert relative to an object, i.e., a brake rotor, which is not part of the positively recited structure of the insert. Id. In addition, the Examiner notes that because the brake rotor itself is not structurally defined in this claim, the brake rotor may be variable configuration and dimension. Id. As such, the Examiner determines that claims 1-8, 33, and 34 "are rendered indefinite by reference to an object that is variable since it is unclear what insert configurations and/or dimensions would meet (or not meet) the [limitations of] the claims." Id. In further support of the indefiniteness position, the Examiner notes that Appellants continue to argue that the applied reference structures fail to meet the 4 Appeal2014-008322 Application 12/910, 142 "constructed and arranged" limitation, even though each of the references meet the positive structural limitations of the claims in question. Appellants submit that the ordinary artisan would know or could easily obtain dimensions required for the invention to be used with any of a variety of various brake rotors. Appeal Br. 12 (citing Orthokinetics, Inc., v. Safety Travel Chairs, Inc., 806 F.2d 1565, 1576 (Fed. Cir. 1986)). Appellants further argue that the claims must be read in light of the Specification, and direct our attention to paragraphs 41 and 45, which provide an example of a configuration and dimensions of a brake rotor. Reply Br. 6. Appellants' arguments fail to persuade us of reversible error in the Examiner's determination as to the indefiniteness of claims 1-8, 33, and 34. As the Examiner notes, claim 1 is directed to "[a] product comprising an insertfor a brake rotor." The italicized clause is directed to Appellants' intended use for the insert, and does not positively require that the product include the brake rotor. The limitation in question, the "constructed and arranged" clause defines certain functional and structural features of the insert albeit relative to the brake rotor. These features include 1) providing frictional damping of a brake rotor; 2) to extend radially beyond the brake rotor; and 3) to reduce the total area of the insert exposed to an environment outside of the brake rotor in which the insert is placed. However, these features are recited as part of a "constructed and arranged" clause, which requires that the insert be somehow constructed and arranged relative to a brake rotor which is not a positive structural feature of the claims. To be constructed and arranged, the insert must not only be structurally constructed or configured but also arranged so as to accomplish 5 Appeal2014-008322 Application 12/910, 142 the functional and structural features as listed above. Yet, without the brake rotor, it is not possible to construct and arrange the insert to do so. Therefore, Appellants' claims present a conundrum in which the brake rotor is not a positive limitation, but is necessary to accomplish the "constructed and arranged" clause. In essence, Appellants' claims present a relationship between two structures where only one of the structures is the subject of the claim. Further, we note that Appellants' disclosure of examples of parts that the insert may be located in including, inter alia, a brake rotor (Spec. i-f 41) or a rotor assembly (id. at i-f 45), is insufficient to remedy the indefiniteness problem in these claims. Such examples fail to address the conundrum, and fails to address the Examiner's concern that on the one hand, Appellants state that one skilled in the art could determine the configuration and dimensions required for the insert to be used with any variety of brake rotors, and on the other hand, Appellants argue that the prior art fails to teach the configuration and dimensions. Indeed, Appellant states that the "constructed and arranged" language "denotes an actual state of configuration that fundamentally ties the insert with the brake rotor to the physical characteristics of the insert ... [which] reaches well beyond merely describing an intended use since the claims actively recite an actual state of configuration." Appeal Br. 14. As for Appellants' reliance on the Orthokinetics decision, we note that this decision is based on patent validity in a district court, rather than a decision in an ex parte appeal from the US PTO. 9 Our reviewing court has 9 United States Patent and Trademark Office. 6 Appeal2014-008322 Application 12/910, 142 "noted that indefiniteness rejections by the USPTO arise in a different posture from that of indefiniteness challenges to an issued patent." In re Packard, 751F.3d1307, 1312 (Fed. Cir. 2014). Further, our reviewing court stated: during patent prosecution [ ] claims can be amended, ambiguities should be recognized, scope and breadth of language explored, and clarification imposed .... An essential purpose of patent examination is to fashion claims that are precise, clear, correct, and unambiguous. Only in this way can uncertainties of claim scope be removed, as much as possible, during the administrative process. In re Zletz, 893 F.2d 319, 321-322 (Fed. Cir. 1989). Finally, Orthokinetics decided the definiteness of a patent claim that recited a wheelchair dimensioned to fit into a vehicle. This issue is quite different from the issue before us which involves a "constructed and arranged" clause including functional and structural features relative to a part that is not a positive limitation of the claim. Appellants' have not persuasively explained why this "constructed and arranged" clause is not actually unclear. Packard, 751 F .3d at 1311. We, therefore, will sustain the Examiner's indefiniteness rejection. Rejection B: Anticipation by Miskinis Appellants argue claim 29 separately, and the rest of the claims as a group. We select claim 1 to decide the issues raised by Appellants, and the remaining claims 2, 4, 5, and 7 stand or fall with claim 1. Anticipation is established when a single prior art reference discloses all features of the claimed invention. In re Spada, 911 F.2d 705, 708 (Fed. Cir. 1990); Celeritas Techs., Ltd. v. Rockwell Int'! Corp., 150 F.3d 1354, 7 Appeal2014-008322 Application 12/910, 142 1361 (Fed. Cir. 1998) (A claim is anticipated only where "each and every limitation is found either expressly or inherently in a single prior art reference.") Further, as we previously held, certain of the appealed claims are indefinite under 35 U.S.C. § 112, second paragraph, due to the "constructed and arranged" clause. In our view, this situation is distinguishable from the situation presented in In re Steele, 305 F .2d 859 (CCP A 1962) where the court stated that the Examiner and Board engaged in considerable speculation as to the meaning of claim terms and made a number of assumptions respecting the scope of the claims. Here, the Examiner finds, and we agree, that the "constructed and arranged" clause is merely directed to Appellants' intended use for the insert because the claims do not positively recite the brake rotor as a structural limitation of the claims, nor do Appellants ever state such. Instead, this clause recites the actual state of configuration of the insert alone, such that it is capable of the functional and structural features recited in the clause upon being located in a brake rotor. However, because the brake rotor is neither positively recited in Appellants' claims, nor are any structural features of the brake rotor recited, as the Examiner finds, and we agree, the "constructed and arranged" clause merely recites Appellants' intended use for the insert. Therefore, unlike Steele, our holding that certain of Appellants' claims are indefinite does not compel a conclusion that the Examiner's § 102(b) rejection be reversed as based on unsupported speculative assumptions. In other words, as the Examiner explains, Miskinis meets the structural recitations of the claim and would be capable of being used as Appellants' "constructed and arranged" intends by merely modifying the 8 Appeal2014-008322 Application 12/910, 142 configuration and dimensions of a brake rotor in which the insert may be placed. See Ex parte Saceman, 27 USPQ2d 1472, 1474 (BPAI 1993); Ex parte Ionescu, 222 USPQ 537 (BPAI 1984). Claim 1 Appellants argue that Miskinis fails to teach two elements of claim 1 : 1) the tabs are tapered (Appeal Br. 13-14); and 2) "the insert is constructed and arranged to provide frictional damping of a brake rotor to extend radially beyond the brake rotor and to reduce the total area of the insert exposed to an environment outside of the brake rotor in which the insert is placed" (id. at 14--15). Turning to the first element, Appellants assert that Miskinis shows various embodiments of a brake rotor showing radially extending rectangular tabs or slotted tabs which are bent to extend perpendicular to the insert. Id. at 13. Appellants also offer a definition of "tapered'' as meaning "gradual diminution of width or thickness in an elongated object." Id. at 14 (citing only to "Dictionary.com"). According to Appellants, "none of [Miskinis'] Figures 1-12 teach or disclose 'tapered' tabs nor does the remainder of the [S]pecification of Miskinis teach or disclose this feature." Id. We disagree. As the Examiner finds, Miskinis' Figure 7 shows tabs 11010 extending radially from an annular body portion 100, the tabs having a tapered portion 112. See also Miskinis i-f 28. Appellants do not explain how Miskinis' tapered tab portions 112 are do not have a gradual diminution of 10 Throughout this Opinion, for clarity, we present labels to elements in figures in bold font, regardless of their presentation in the original document. 9 Appeal2014-008322 Application 12/910, 142 width or thickness therein in accord with Appellants' proffered definition. Therefore, Appellants have not persuasively identified reversible error in the Examiner's finding that Miskinis teaches tapered tabs. With regard to Appellants' second argued element not shown in Miskinis, Appellants contend the "constructed and arranged" clause requires more than intended use. Appeal Br. 14. Instead, Appellants urge that this clause "denotes an actual state of configuration that fundamentally ties the insert with the brake rotor to the physical characteristics of the insert." Id. Appellants submit that Miskinis fails to teach or disclose an insert so defined. Id. at 15. We do not find Appellants' arguments persuasive of reversible error. As the Examiner finds, Miskinis meets the positive structural limitations of the claims and, therefore, would have reasonably been expected to be capable of being combined with a brake rotor of variable configuration and dimensions so as to provide frictional damping of the brake rotor, to extend radially beyond the brake rotor, and to reduce the total area of the insert exposed to the environment outside the rotor. "[A]pparatus claims cover what a device is, not what a device does." Hewlett-Packard Co. v. Bausch & Lomb Inc., 909 F.2d 1464, 1468 (Fed. Cir. 1990). Therefore, the patentability of an apparatus claim depends on the claimed structure, not on the use or purpose of that structure, Catalina Mktg. Int'!, Inc. v. Coolsavings.com, Inc., 289 F.3d 801, 809 (Fed. Cir. 2002), or the function or result of that structure. In re Danly, 263 F.2d 844, 848 (CCPA 1959); In re Gardiner, 171F.2d313, 315-16 (CCPA 1948). Although "[a] patent applicant is free to recite features of an apparatus either structurally or functionally[,] .... choosing to define an 10 Appeal2014-008322 Application 12/910, 142 element functionally, i.e., by what it does, carries with it a risk." In re Schreiber, 128 F.3d 1473, 1478 (Fed. Cir. 1997). Where the Examiner establishes a reasonable belief that a property or characteristic recited in the claims would have been inherent to the apparatus, the burden of proof shifts to Appellant to show that this characteristic or property is not possessed by the prior art. Id. Appellants have not shown any structural difference between the Miskinis insert and that of the claims, nor have Appellants provided any evidence or persuasive technical reasoning to refute the Examiner's reasonable determination that Miskinis' insert would have been capable of, when combined in a brake rotor, frictionally damping the rotor, extending radially beyond the rotor, and/or reducing the total area of the insert exposed to the environment beyond the rotor. "It is well settled that the recitation of a new intended use for an old product does not make a claim to that old product patentable.'' Schreiber, 128 F.3d at 1477. In their Reply Brief, Appellants present a new argument not raised in the Appeal Brief concerning the claim 1 limitation "a plurality of tabs extending radially from the body portion" (Reply Br. 7). In addition, Appellants also argue for the first time in the Reply Brief that Miskinis teaches away from Appellants' use as recited in the "constructed and arranged" clause (id. at 10). Under regulations governing appeals to the Board, any new argument not timely presented in the Appeal Brief will not be considered when filed in a Reply Brief, absent a showing of good cause explaining why the argument could not have been presented in the Appeal Brief. See Ex parte Borden, 93 USPQ2d 14 73, 14 7 6-77 (BP AI 2010) (informative). See also 37 C.F.R. § 41.37 and§ 41.41. Appellants have 11 Appeal2014-008322 Application 12/910, 142 provided this record with no such showing. Accordingly, we will not consider these new arguments in the Reply Brief. Claim 29 Appellants argue that Miskinis fails to teach or disclose that the tab has a first end with a greater width than a second end, and the second end is radially spaced from the annular portion. Appeal Br. 16. However, although Appellants urge that Miskinis' tabs as shown in Figure 7 do not meet these limitations, Appellants do not persuasively explain why these tapered tabs 112, which clearly have a narrower width at an end distal from the annular body portion 100 than the end connecting the tabs to the body portion, and whose distal end is clearly depicted to be radially spaced from the body portion, do not actually meet the limitations in question. We note that claim 29 does not require that the radially spaced second end is co- planar with the annular body portion. Rejections C and D: Obviousness over Miskinis, alone or in view of Hanna Appellants argue that Miskinis and Hanna fail to teach various features of Appellants' claims. Appeal Br. 17-20. We find that the Examiner has made extensive fact finding with respect to the argued claims. See Ans. 4--8 and 15-16. Nonetheless, Appellants' arguments repeatedly restate elements of the claim language and simply asserts that the elements are missing from Miskinis and Hanna. Apart from summarily asserting that Miskinis and Hanna fail to teach or disclose the features of the claims covered by this rejection, Appellants do not present any arguments to explain why the Examiner's explicit fact findings and conclusions in this rejection are in error. 12 Appeal2014-008322 Application 12/910, 142 Appellants' unexplained arguments provide no basis to reject the Examiner's findings and conclusions on these points. See 37 C.F.R. § 41.37(c)(l)(iv) ("A statement which merely points out what a claim recites will not be considered an argument for separate patentability of the claim."); see also In re Lovin, 652 F.3d 1349, 1357 (Fed. Cir. 2011) (holding that "the Board reasonably interpreted Rule 41.37 to require more substantive arguments in an appeal brief than a mere recitation of the claim elements and a naked assertion that the corresponding elements were not found in the prior art"). Therefore, we do not find Appellants' arguments persuasive of reversible error in the Examiner's obviousness rejection over Miskinis, alone or in view of Hanna. Rejections E and F: Anticipation by, and Obviousness over, Chuo Appellants argue that one of ordinary skill in the art would know that a bicycle sprocket as described in Chuo could not be used as an insert for a brake rotor. Appeal Br. 21. However, this argument fails to persuade because Appellants fail to explain why the ordinary artisan would know that Chuo' s sprocket could not be used as an insert for a brake rotor. In this regard, we note that the Examiner's finding of anticipation is based on an individual sprocket or wheel of Chuo, not the combined sprocket module including the chain wheels, the freewheel sprocket, the start wheel, and other bicycle components, as Appellants mistakenly imply. Appellants further argue that, while Chuo' s Figure 3 shows sprocket 40 and start wheel 50 having semi-tapered tabs, the sprocket and wheel do not include exposed arc segments having a common center. Appeal Br. 22. However, Appellants do not specifically address the Examiner's finding that 13 Appeal2014-008322 Application 12/910, 142 gears or sprockets 20, 33 each have spaced regions between adjacent tapered tabs (teeth of the gears). Appellants also do not explain why these spaced regions are not exposed arc segments. Finally, Appellants argue that Chuo fails to teach various features of Appellants' claims. Appeal Br. 21-25. We find that the Examiner has made extensive fact finding with respect to the argued claims. See Ans. 8-10. Nonetheless, Appellants' arguments repeatedly restate elements of the claim language and simply assert that the elements are missing from Chuo. Apart from summarily asserting that Chuo fails to teach or disclose the features of the claims covered by these rejections, Appellants do not present any arguments to explain why the Examiner's explicit fact findings and conclusions in these rejections are in error. Appellants' unexplained arguments provide no basis to reject the Examiner's findings and conclusions on these points. See 37 C.F.R. § 41.37(c)(l)(iv); Lovin, 652 F.3d at 1357. Therefore, we do not find Appellants' arguments persuasive of reversible error in the Examiner's anticipation and obviousness rejections over Chuo. Rejections G and H: Anticipation by, and Obviousness over, McDowall Appellants argue that McDowall, Figures 1---6, show spline teeth 52 of clutch plate 18 having generally rectangular edges, and the clutch plate fails to include exposed arc segments. Appeal Br. 26. Appellants also assert that the space between the land and grooves 62, 61 is linear. Id. However, McDowall, Figure 3, clearly shows that the teeth or tabs are both tapered and spaced apart. Moreover, while the spaces between the teeth are individually short so as to appear linear, these spaces arc around the 14 Appeal2014-008322 Application 12/910, 142 interior of the annular body portion. Appellants do not explain why these spaces are not exposed arc segments. Finally, Appellants argue that McDowall fails to teach various features of Appellants' claims. Appeal Br. 26-29. We find that the Examiner has made extensive fact finding with respect to the argued claims. See Ans. 10-11. Nonetheless, Appellants' arguments repeatedly restate elements of the claim language and simply assert that the elements are missing from McDowall. Apart from summarily asserting that McDowall fails to teach or disclose the features of the claims covered by these rejections, Appellants do not present any arguments to explain why the Examiner's explicit fact findings and conclusions in these rejections are in error. Appellants' unexplained arguments provide no basis to reject the Examiner's findings and conclusions on these points. 37 C.F.R. § 41.37(c)(l)(iv); Lovin, 652 F.3d at 1357. Therefore, we do not find Appellants' arguments persuasive of reversible error in the Examiner's anticipation and obviousness rejections over McDowall. Rejection I: Anticipation by Hendrickson Appellants argue that Hendrickson fails to teach various features of Appellants' claims. Appeal Br. 30-31. We find that the Examiner has made extensive fact finding with respect to the argued claims. See Ans.12. Nonetheless, Appellants' arguments repeatedly restate elements of the claim language and simply assert that the elements are missing from Hendrickson. Apart from summarily asserting that Hendrickson fails to teach or disclose the features of the claims covered by this rejection, Appellants do not 15 Appeal2014-008322 Application 12/910, 142 present any arguments to explain why the Examiner's explicit fact findings and conclusions in this rejection is in error. Appellants' unexplained arguments provide no basis to reject the Examiner's findings and conclusions on these points. 37 C.F.R. § 41.37(c)(l)(iv); Lovin, 652 F.3d at 1357. Therefore, we do not find Appellants' arguments persuasive of reversible error in the Examiner's anticipation rejection by Hendrickson. Rejections J and K: Anticipation by, and Obviousness over, Stanley Appellants argue that Stanley fails to teach various features of Appellants' claims. Appeal Br. 32-35. We find that the Examiner has made extensive fact finding with respect to the argued claims. See Ans. 13-14. Nonetheless, Appellants' arguments repeatedly restate elements of the claim language and simply assert that the elements are missing from Stanley. Apart from summarily asserting that Stanley fails to teach or disclose the features of the claims covered by these rejections, Appellants do not present any arguments to explain why the Examiner's explicit fact findings and conclusions in these rejections are in error. Appellants' unexplained arguments provide no basis to reject the Examiner's findings and conclusions on these points. 37 C.F.R. § 41.37(c)(l)(iv); Lovin, 652 F.3d at 1357. Therefore, we do not find Appellants' arguments persuasive of reversible error in the Examiner's anticipation and obviousness rejections over Stanley. 16 Appeal2014-008322 Application 12/910, 142 CONCLUSION Upon consideration of the record, and for the reasons given above and in the Answer, we sustain each of the Examiner's rejections on appeal. DECISION The decision of the Examiner rejecting claims 1-8, 18-30, and 32-34 is affirmed. No time period for taking any subsequent action in connection with this appeal may be extended under 37 C.F.R. § 1.136(a)(l). AFFIRMED 17 Copy with citationCopy as parenthetical citation