37 CFR § 1.115 - Preliminary amendments.
---
identifier: "/us/cfr/t37/s1.115"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 1.115 - Preliminary amendments."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "1.115"
section_name: "Preliminary amendments."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---
# 1.115 Preliminary amendments.
(a) A preliminary amendment is an amendment that is received in the Office (§ 1.6) on or before the mail date of the first Office action under § 1.104. The patent application publication may include preliminary amendments (§ 1.215(a)).
(1) A preliminary amendment that is present on the filing date of an application is part of the original disclosure of the application.
(2) A preliminary amendment filed after the filing date of the application is not part of the original disclosure of the application.
(b) A preliminary amendment in compliance with § 1.121 will be entered unless disapproved by the Director.
(1) A preliminary amendment seeking cancellation of all the claims without presenting any new or substitute claims will be disapproved.
(2) A preliminary amendment may be disapproved if the preliminary amendment unduly interferes with the preparation of a first Office action in an application. Factors that will be considered in disapproving a preliminary amendment include:
(i) The state of preparation of a first Office action as of the date of receipt (§ 1.6) of the preliminary amendment by the Office; and
(ii) The nature of any changes to the specification or claims that would result from entry of the preliminary amendment.
(3) A preliminary amendment will not be disapproved under (b)(2) of this section if it is filed no later than:
(i) Three months from the filing date of an application under § 1.53(b);
(ii) The filing date of a continued prosecution application under § 1.53(d); or
(iii) Three months from the date the national stage is entered as set forth in § 1.491 in an international application.
(4) The time periods specified in paragraph (b)(3) of this section are not extendable.
[69 FR 56543, Sept. 21, 2004]