This clause is marked [Reserved] under the Revolutionary FAR Overhaul (Deviation 2026-O0036). It no longer applies to contracts using the RFO model.
View deviation details252.227-7000 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)
Change History
| Date | Authority | Type | Summary |
|---|---|---|---|
| 2026-02-01 | 2026-O0036 | RFO_CLAUSE_MODIFIED | R-DFARS 252.227-7000 - 252.227-7012 [Reserved] updated from deviation 2026-O0036. |
| 2026-02-01 | 2026-O0036 | RFO_CLAUSE_ADDED | R-DFARS 252.227-7000 - 252.227-7012 [Reserved] added from deviation 2026-O0036. |
The prescription shown below is from the codified eCFR. Under the RFO, the prescribing section may have been revised, relocated or reserved. See the deviation memorandum for the current prescription authority.
View deviation: 2026-O0036 →R-DFARS Prescription Source
This clause is prescribed in the R-DFARS by the following deviation:
-
2026-O0036
— DFARS RFO Implementation (Part 27)
(DFARS Part 227)
Add clause 252.227-7000
227.7009-1
(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 .
Regulatory Stack
The layers of regulation that govern this clause, from the FAR prescription through agency-specific supplements and any active deviations.
R-DFARS
R-DFARS Prescription
Per Deviation 2026-O0036 (DFARS Part 227)
DFARS
DFARS Supplement (eCFR)
⚠ May be superseded by RFO
227.7009-1
(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 .
Version History
Version history is sourced from the codified eCFR. Changes published only as class deviations or by the Revolutionary FAR Overhaul do not appear here until they are incorporated into the eCFR. For RFO-driven changes see the RFO Version tab and any active deviations cited above.
No version history available from eCFR.