48 CFR § 252.227-7000 - 252.227-7000 Non-estoppel.

---
identifier: "/us/cfr/t48/s252.227-7000"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "48 CFR § 252.227-7000 - 252.227-7000   Non-estoppel."
title_number: 48
title_name: "Federal Acquisition Regulations System"
section_number: "252.227-7000"
section_name: "252.227-7000   Non-estoppel."
chapter_number: 2
chapter_name: "DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE"
subchapter_number: "H"
subchapter_name: "CLAUSES AND FORMS"
part_number: "252"
part_name: "SOLICITATION PROVISIONS AND CONTRACT CLAUSES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "41 U.S.C. 1303 and 48 CFR chapter 1."
regulatory_source: "56 FR 36479, July 31, 1991, unless otherwise noted."
cfr_part: "252"
---


# 252.227-7000 252.227-7000   Non-estoppel.

As prescribed at 227.7009-1, insert the following clause in patent releases, license agreements, and assignments:

****Non-Estoppel (OCT 1966)

The Government reserves the right at any time to contest the enforceability, validity, scope of, or the title to any patent or patent application herein licensed without waiving or forfeiting any right under this contract.

****(End of clause)