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FAR and DFARS › DFARS Part 252: Solicitation Provisions and Contract Clauses › Subpart 252.2

DFARS 252.227-7000 Non-estoppel.

The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.

In plain English

This DFARS clause states that the Government keeps the right to challenge the enforceability, validity, scope, or title of any patent or patent application covered by the agreement. It matters because a contractor cannot assume the Government's acceptance of the patent rights waives the Government's ability to dispute them later.

Applies to: Patent releases, license agreements, and assignments that include this clause

Key terms: Non-Estoppel · enforceability · validity · scope · title

Written by AI from this section's text. A guide, not legal advice: the text below rules.

The text

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)

Sections it refers to

Sections that refer to it

← 252.226-7003 Drug-Free Work Force. · 252.227-7001 Release of past infringement. →

Rule changes for DFARS Part 252

Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Plain words for the terms: glossary.

DFARS 252.227-7000 Non-estoppel · SpendQuery