# 252.227-7000 Non-estoppel.
Type: Clause
Prescribed in: 227.7009-1
Current version date: OCT 1966

## Prescription and Applicability

### DFARS Prescription, 227.7009-1

(a) Covenant Against Contingent Fees. Insert the clause at FAR 52.203-5.
(b) Gratuities. Insert the clause at FAR 52.203-3.
(c) Assignment of Claims. Insert the clause at FAR 52.232-23.
(d) Disputes. Pursuant to FAR Subpart 33.2, insert the clause at FAR 52.233-1.
(e) Non-Estoppel. Insert the clause at 252.227-7000 .

## Current Text

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)

## Active Class Deviations Affecting This Clause

### Class Deviation 2026-O0036, DFARS RFO Implementation (Part 27)
- Status: Active
- Date Issued: 2026-02-01
- Change type: MODIFIED
- Action: Modified by RFO class deviation

## Suggested Questions

You can ask your AI assistant:
- Should I include this provision in my solicitation?
- Does this clause apply to commercial acquisitions?
- Does this clause apply to R&D contracts under Part 35?
- Which alternate should I use for a multiple-award contract?
- Are there any active Class Deviations that modify this clause?
- What changed in the most recent amendment?

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Source: https://part52.dev
Generated: 2026-04-21 17:40 UTC
Reference: https://www.ecfr.gov/current/title-48/section-252.227-7000