37 CFR § 1.957 - Failure to file a timely, appropriate or complete response or comment in reexamination.

---
identifier: "/us/cfr/t37/s1.957"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 1.957 - Failure to file a timely, appropriate or complete response or comment in  reexamination."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "1.957"
section_name: "Failure to file a timely, appropriate or complete response or comment in  reexamination."
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"
---


# 1.957 Failure to file a timely, appropriate or complete response or comment in  reexamination.

(a) If the third party requester files an untimely or inappropriate comment, notice of appeal or brief in an *inter partes* reexamination, the paper will be refused consideration.

(b) If no claims are found patentable, and the patent owner fails to file a timely and appropriate response in an *inter partes* reexamination proceeding, the prosecution in the reexamination proceeding will be a terminated prosecution and the Director will proceed to issue and publish a certificate concluding the reexamination proceeding under § 1.997 in accordance with the last action of the Office.

(c) If claims are found patentable and the patent owner fails to file a timely and appropriate response to any Office action in an *inter partes* reexamination proceeding, further prosecution will be limited to the claims found patentable at the time of the failure to respond, and to any claims added thereafter which do not expand the scope of the claims which were found patentable at that time.

(d) When action by the patent owner is a *bona fide* attempt to respond and to advance the prosecution and is substantially a complete response to the Office action, but consideration of some matter or compliance with some requirement has been inadvertently omitted, an opportunity to explain and supply the omission may be given.

[65 FR 76777, Dec. 7, 2000, as amended at 72 FR 18906, Apr. 16, 2007]