35 U.S.C. § 151
Section 151 · Issue of patent
Amended 1 time on record
Applied in 35 court decisions — leading case Markman v. Westview Instruments, Inc. (1995)
Most recently applied in Nippon Shinyaku Co. v. Iancu (February 2019)
How often courts cite this section
Court decisions citing this, by year.Markers show enactment, consequential amendments, and circuit splits over this section — watch for a citation surge after a change or a disagreement. The dip in the last several years is a data-coverage gap, not a real trend — our corpus holds fewer opinions from the most recent years, so recent citations are undercounted.
(a) In General.—If it appears that an applicant is entitled to a patent under the law, a written notice of allowance of the application shall be given or mailed to the applicant. The notice shall specify a sum, constituting the issue fee and any required publication fee, which shall be paid within 3 months thereafter.
(b) Effect of Payment.—Upon payment of this sum the patent may issue, but if payment is not timely made, the application shall be regarded as abandoned.
Editorial notes U.S. Code · Office of the Law Revision Counsel
Prior Provisions
A prior section 151, act July 19, 1952, ch. 950, 66 Stat. 803; Pub. L. 89–83, §4, July 24, 1965, 79 Stat. 260; Pub. L. 93–601, §3, Jan. 2, 1975, 88 Stat. 1956; Pub. L. 106–113, div. B, §1000(a)(9) [title IV, §4732(a)(10)(A)], Nov. 29, 1999, 113 Stat. 1536, 1501A–582; Pub. L. 107–273, div. C, title III, §13206(b)(1)(B), Nov. 2, 2002, 116 Stat. 1906, related to issue of patent, prior to repeal by Pub. L. 112–211, title II, §202(b)(6), Dec. 18, 2012, 126 Stat. 1536.
Effective Date
Section effective on the date that is 1 year after Dec. 18, 2012, applicable to patents issued before, on, or after that date and patent applications pending on or filed after that date, and not effective with respect to patents in litigation commenced before that date, see section 203 of Pub. L. 112–211, set out as a note under section 27 of this title.