Derived from Title 35, U.S.C., 1946 ed., § 69 (R.S. 4920, amended (1) Mar. 3, 1897, ch. 391, § 2, 29 Stat. 692, (2) Aug. 5, 1939, ch. 450, § 1, 53 Stat. 1212).

The first paragraph declares the existing presumption of validity of patents.

The five defenses named in R.S. 4920 are omitted and replaced by a broader paragraph specifying defenses in general terms.

The third paragraph, relating to notice of prior patents, publications and uses, is based on part of the last paragraph of R.S. 4920 which was superseded by the Federal Rules of Civil Procedure but which is reinstated with modifications.

2002—Third par. Pub. L. 107–273, § 13206(b)(4), made technical correction to directory language of Pub. L. 106–113, § 1000(a)(9) [title IV, § 4402(b)(1)]. See 1999 Amendment note below.

Pub. L. 107–273, § 13206(b)(1)(B), made technical correction to directory language of Pub. L. 106–113, § 1000(a)(9) [title IV, § 4732(a)(10)(A)]. See 1999 Amendment note below.

1999—Third par. Pub. L. 106–113, § 1000(a)(9) [title IV, § 4732(a)(10)(A)], as amended by Pub. L. 107–273, § 13206(b)(1)(B), substituted “(2) by the Director,” for “(2) by the Commissioner,”.

Pub. L. 106–113, § 1000(a)(9) [title IV, § 4402(b)(1)], as amended by Pub. L. 107–273, § 13206(b)(4), substituted “154(b) or 156 of this title” for “156 of this title”.

1995—First par. Pub. L. 104–41 inserted after second sentence “Notwithstanding the preceding sentence, if a claim to a composition of matter is held invalid and that claim was the basis of a determination of nonobviousness under section 103 (b)(1), the process shall no longer be considered nonobvious solely on the basis of section 103 (b)(1).”

1992—Third par. Pub. L. 102–572 substituted “United States Court of Federal Claims” for “United States Claims Court”.

1984—Pub. L. 98–417 inserted provision at end that the invalidity of the extension of a patent term or any portion thereof under section 156 of this title because of the material failure by the applicant for the extension, or by the Commissioner, 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, and that a due diligence determination under section 156 (d)(2) is not subject to review in such an action.

1982—Third par. Pub. L. 97–164 substituted “Claims Court” for “Court of Claims”.

1975—First par. Pub. L. 94–131 made presumption of validity applicable to claim of a patent in multiple dependent form and multiple dependent claims and substituted “asserting such invalidity” for “asserting it”.

1965—Pub. L. 89–83 required each claim of a patent (whether in independent or dependent form) to be presumed valid independently of the validity of other claims and required dependent claims to be presumed valid even though dependent upon an invalid claim.

Amendment by section 1000 (a)(9) [title IV, § 4402(b)(1)] of Pub. L. 106–113 effective on date that is 6 months after Nov. 29, 1999, and, except for design patent application filed under chapter 16 of this title, applicable to any application filed on or after such date, see section 1000 (a)(9) [title IV, § 4405(a)] of Pub. L. 106–113, set out as a note under section 154 of this title.

Amendment by section 1000 (a)(9) [title IV, § 4732(a)(10)(A)] of Pub. L. 106–113 effective 4 months after Nov. 29, 1999, see section 1000 (a)(9) [title IV, § 4731] of Pub. L. 106–113, set out as a note under section 1 of this title.

Amendment by Pub. L. 102–572 effective Oct. 29, 1992, see section 911 of Pub. L. 102–572, set out as a note under section 171 of Title 28, Judiciary and Judicial Procedure.

Amendment by Pub. L. 97–164 effective Oct. 1, 1982, see section 402 of Pub. L. 97–164, set out as a note under section 171 of Title 28, Judiciary and Judicial Procedure.

Amendment by Pub. L. 94–131 effective Jan. 24, 1978, and applicable on and after that date to patent applications filed in the United States and to international applications, where applicable, see section 11 of Pub. L. 94–131, set out as an Effective Date note under section 351 of this title.

Amendment by Pub. L. 89–83 effective 3 months after July 24, 1965, see section 7(a) of Pub. L. 89–83, set out as a note under section 41 of this title.