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Patent US3759981A successfully refreshed from Google Patents.
US3759981A
Expired / Lapsed
US
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Esters of perfluoroalkyl terminated alkylene thioalkanoic acids
Assignee: Pennwalt Corp
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Filing: 1971-05-20
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Granted: 1973-09-18
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Expires: 1991-05-20
Abstract
Abstract Sulfur-containing, perfluoroalkyl amines and their quaternary salt and amine oxide derivatives having outstanding surfactant properties are provided having the structures WHERE Rf is straight or branched-chain perfluoroalkyl, R is hydrogen or methyl, R1 and R2 are independently hydrogen or lower alkyl, n is an integer of 1 to 3, m is an integer of 2 to 4; X is an anion, y is an integer equal to k, the valence of X; z is 0 or 1, and when z is 1, then R3 is hydrogen, lower alkyl or CH2COOH; and when z is 0, then R3 is oxygen, CH2COO , CH2CH2COO or CH2CH2CH2SO3 .
Inventors
- 👤 Hager R Bonner
- 👤 G Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:15
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/004; C07; C07C; C07C291/00; C07C291/02; C07C291/04; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/065; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
10 words
A compound according to claim 1 wherein n is 2.
Claim 2
Dependent Claim
20 words
A compound according to claim 1 wherein R1 and R2 are each methyl, m is 2, and R is CH3.
Claim 3
Dependent Claim
10 words
A compound according to claim 3 where n is 2.
Claim 4
Dependent Claim
23 words
The compound having the formula (Rf(CH2)2SCH2CH(CH3)COO(CH2)2N(CH3)2CH2COOH) Cl where Rf is a straight or branched perfluoroalkyl group having from 5 to 13 carbon atoms.
Claim 5
Dependent Claim
10 words
A compound according to claim 5 where Rf is (CF3)2CF(CF2)4
Claim 6
Dependent Claim
10 words
A compound according to claim 5 where Rf is (CF3)2CF(CF2)6
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |