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.
- (b) DEFENSES.—The following shall be defenses in any action involving the validity or infringement of a patent and shall be pleaded:
- (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.
- (3) Invalidity of the patent or any claim in suit for failure to comply with—
- (4) Any other fact or act made a defense by this title.
- (c) NOTICE OF ACTIONS; ACTIONS DURING EXTENSION OF PATENT TERM.— In an action involving the validity or infringement of a patent the party asserting invalidity or noninfringement shall give notice in the pleadings or otherwise in writing to the adverse party at least thirty days before the trial, of the country, number, date, and name of the patentee of any patent, the title, date, and page numbers of any publication to be relied upon as anticipation of the patent in suit or, except in actions in the United States Court of Federal Claims, as showing the state of the art, and the name and address of any person who may be relied upon as the prior inventor or as having prior knowledge of or as having previously used or offered for sale the invention of the patent in suit. In the absence of such notice proof of the said matters may not be made at the trial except on such terms as the court requires.
- (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.)