35 U.S.C. 282 — Presumption of validity; defenses

35 U.S.C. 282 — Presumption of validity; defenses.

(a) IN GENERAL.—A patent shall be presumed valid. Each claim of a patent (whether in independent, dependent, or multiple dependent form) shall be presumed valid independently of the validity of other claims; dependent or multiple dependent claims shall be presumed valid even though dependent upon an invalid claim. The burden of establishing invalidity of a patent or any claim thereof shall rest on the party asserting such invalidity.

(1) Noninfringement, absence of liability for infringement, or unenforceability.

(2) Invalidity of the patent or any claim in suit on any ground specified in part II as a condition for patentability.

(A) any requirement of section 112 , except that the failure to disclose the best mode shall not be a basis on which any claim of a patent may be canceled or held invalid or otherwise unenforceable; or

(B) any requirement of section 251 .

(4) Any other fact or act made a defense by this title.

Invalidity of the extension of a patent term or any portion thereof under section 154(b) or 156 because of the material failure—

(1) by the applicant for the extension, or

(2) by the Director,

to comply with the requirements of such section shall be a defense in any action involving the infringement of a patent during the period of the extension of its term and shall be pleaded. A due diligence determination under section 156(d)(2) is not subject to review in such an action.

(Amended July 24, 1965, Public Law 89-83, sec. 10, 79 Stat. 261; Nov. 14, 1975, Public Law 94-131, sec. 10, 89 Stat. 692; Apr. 2, 1982, Public Law 97-164, sec. 161(7), 96 Stat. 49; Sept. 24, 1984, Public Law 98-417, sec. 203, 98 Stat. 1603; Oct. 29, 1992, Public Law 102-572, sec. 902(b)(1), 106 Stat. 4516; Nov. 1, 1995, Public Law 104-41, sec. 2, 109 Stat. 352; Nov. 29, 1999, Public Law 106-113, sec. 1000(a)(9), 113 Stat. 1501A-560, 582 (S. 1948 secs. 4402(b)(1) and 4732(a)(10)(A)); amended Sept. 16, 2011, Public Law 112-29, sec. 15(a) (effective Sept. 16, 2011) and secs. 20(g) and (j) (effective Sept. 16, 2012), 125 Stat. 284.)

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