37 CFR § 1.601 - Filing of papers in supplemental examination.

---
identifier: "/us/cfr/t37/s1.601"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 1.601 - Filing of papers in supplemental examination."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "1.601"
section_name: "Filing of papers in supplemental examination."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "1"
part_name: "RULES OF PRACTICE IN PATENT CASES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "35 U.S.C. 2(b)(2), unless otherwise noted."
regulatory_source: "24 FR 10332, Dec. 22, 1959, unless otherwise noted."
cfr_part: "1"
---


# 1.601 Filing of papers in supplemental examination.

(a) A request for supplemental examination of a patent must be filed by the owner(s) of the entire right, title, and interest in the patent.

(b) Any party other than the patent owner (*i.e.,* any third party) is prohibited from filing papers or otherwise participating in any manner in a supplemental examination proceeding.

(c) A request for supplemental examination of a patent may be filed at any time during the period of enforceability of the patent.