Patent US3933831A successfully refreshed from Google Patents.
US3933831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorinated tertiary amines
Assignee: PCR Group Inc
•
Filing: 1973-11-07
•
Granted: 1976-01-20
•
Expires: 1993-11-07
Abstract
Abstract Thermally and oxidatively stable perfluorinated tertiary amines of the formula: ##EQU1## ARE DISCLOSED, AS WELL AS THE PROCESS FOR MAKING THESE AND OTHER COMPOUNDS. The carbonyl group of imides or amides is reduced with SF 4 using HF as the reaction solvent at a reaction temperature of 25°-300°C. Cyclic imides can be used as starting compounds, and tertiary amines containing unsaturated moieties can be produced. The perfluorinated tertiary amines have various uses in view of their high degree of thermal and oxidative stability, including uses as hydraulic fluids or transformer dielectric fluids.
Inventors
- 👤 Ralph J. De Pasquale
- 👤 Keith B. Baucom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:43
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/34; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/18; C07D211/80; C07D211/84; C07D211/86; C07D211/88; C07D251/04; C07D251/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
Perfluorinated tertiary amine of the formula ##EQU17## wherein R 7 f a. is -- C n .sbsb.3F 2n .sbsb.3, wherein n 3 is 2-20, and R 8 f is a perfluorinated aryl group, wherein any substituents on the aryl ring are perfluorinated alkyl substituents, wherein R 8 f contains about 6-12 carbon atoms.
Claim 2
Dependent Claim
53 words
Perfluorinated tertiary amine of the formula ##EQU17## wherein R 7 f a. is -- C n .sbsb.3F 2n .sbsb.3, wherein n 3 is 2-20, and R 8 f is a perfluorinated aryl group, wherein any substituents on the aryl ring are perfluorinated alkyl substituents, wherein R 8 f contains about 6-12 carbon atoms.
Claim 3
Dependent Claim
1 words
Perfluoro(N-phenylpiperidine).
Claim 4
Dependent Claim
1 words
Perfluoro(N-phenylpiperidine).
References Cited (Backward Citations)
US2490098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |