US4267348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing benzimidazoles
Assignee: United States Department of the Air Force
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Filing: 1979-12-04
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Granted: 1981-05-12
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Expires: 1999-12-04
Abstract
Abstract Benzimidazoles substituted in the 2-position with a perfluoroalkyleneether radical. The compounds are useful as antirust and anticorrosion additives in grease formulations based on fluorine-containing fluids.
Inventors
- 👤 Christ Tamborski
- 👤 John B. Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:28
CPC Classifications
C; C10; C10M; C10M133/00; C10M133/02; C10M133/38; C10M133/44; C10M133/46; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/12; C10M2215/00; C10M2215/22; C10M2215/221; C10M2215/223; C10M2215/224; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10N; C10N2030/00; C10N2030/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
A fluorine-containing benzimidazole having the following structural formula: ##STR6## wherein R f is an acyclic perfluoroalkyleneether radical.
Claim 2
Dependent Claim
17 words
A fluorine-containing benzimidazole having the following structural formula: ##STR6## wherein R f is an acyclic perfluoroalkyleneether radical.
Claim 3
Dependent Claim
36 words
The fluorine-containing benzimidazole of claim 1 in which R f is CF 2 (OCF 2 CF 2 ) x OC 2 F 5 , where x is zero or an integer from 1 to 10, inclusive.
Claim 4
Dependent Claim
36 words
The fluorine-containing benzimidazole of claim 1 in which R f is CF(CF 3 )[OCF 2 CF(CF 3 )] y OC 3 F 7 , where y is zero or an integer from 1 to 10, inclusive.
Claim 5
Dependent Claim
24 words
The fluorine-containing benzimidazole of claim 3 in which R f is CF(CF 3 )[OCF 2 CF(CF 3 )] 4 OC 3 F 7 .
Claim 6
Dependent Claim
22 words
The fluorine-containing benzimidazole of claim 3 in which R f is CF(CF 3 )OCF 2 CF(CF 3 )OC 3 F 7 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |