37 CFR § 42.102 - Time for filing.

---
identifier: "/us/cfr/t37/s42.102"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 42.102 - Time for filing."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "42.102"
section_name: "Time for filing."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "42"
part_name: "TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "35 U.S.C. 2(b)(2), 3, 6, 21, 23, 41, 134, 135, 143, 153, 311, 312, 314, 316, 318, 321-326, 328; Pub. L. 112-29, 125 Stat. 284; and Pub. L. 112-274, 126 Stat. 2456."
regulatory_source: "77 FR 48669, Aug. 14, 2012, unless otherwise noted."
cfr_part: "42"
---


# 42.102 Time for filing.

(a) A petition for *inter partes* review of a patent must be filed after the later of the following dates, where applicable:

(1) If the patent is a patent described in section 3(n)(1) of the Leahy-Smith America Invents Act, the date that is nine months after the date of the grant of the patent;

(2) If the patent is a patent that is not described in section 3(n)(1) of the Leahy-Smith American Invents Act, the date of the grant of the patent; or

(3) If a post-grant review is instituted as set forth in subpart C of this part, the date of the termination of such post-grant review.

(b) [Reserved]

[77 FR 48727, Aug. 14, 2012, as amended at 78 FR 17874, Mar. 25, 2013; 84 FR 51982, Oct. 1, 2019]