35 U.S.C. § 172
Section 172 · Right of priority
Amended 3 times on record
Applied in 6 court decisions — leading case In re Sung Nam Cho (1987)
Most recently applied in 55 F. Supp. 2d 777 - Ductmate Industries, Inc. v. Famous Supply Corp. (July 1999)
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.
The right of priority provided for by subsections (a) through (d) of section 119 shall be six months in the case of designs. The right of priority provided for by section 119(e) shall not apply to designs.
Editorial notes U.S. Code · Office of the Law Revision Counsel
Historical and Revision Notes
Based on Title 35, U.S.C., 1946 ed., §32, part (R.S. 4887, amended (1) Mar. 3, 1903, ch. 1019, §1, 32 Stat. 1225, 1226, (2) June 19, 1936, ch. 594, 49 Stat. 1529, (3) Aug. 5, 1939, ch. 450, §1, 53 Stat. 1212).
This provision is taken from R.S. 4887 (see section 119) and made a separate section.
Amendments
2011—Pub. L. 112–29, §20(j), struck out “of this title” after “119” and after “119(e)”.
Pub. L. 112–29, §3(g)(1), struck out “and the time specified in section 102(d)” before “shall be six months”.
1994—Pub. L. 103–465 substituted “subsections (a) through (d) of section 119” for “section 119” and inserted at end “The right of priority provided for by section 119(e) of this title shall not apply to designs.”
Effective Date of 2011 Amendment
Amendment by section 3(g)(1) of Pub. L. 112–29 effective upon the expiration of the 18-month period beginning on Sept. 16, 2011, and applicable to certain applications for patent and any patents issuing thereon, see section 3(n) of Pub. L. 112–29, set out as an Effective Date of 2011 Amendment; Savings Provisions note under section 100 of this title.
Amendment by section 20(j) of Pub. L. 112–29 effective upon the expiration of the 1-year period beginning on Sept. 16, 2011, and applicable to proceedings commenced on or after that effective date, see section 20(l) of Pub. L. 112–29, set out as a note under section 2 of this title.
Effective Date of 1994 Amendment
Amendment by Pub. L. 103–465 effective 6 months after Dec. 8, 1994, and applicable to all patent applications filed in the United States on or after that effective date, with provisions relating to earliest filed patent application, see section 534(b)(1), (3) of Pub. L. 103–465, set out as a note under section 154 of this title.