Patent US3900508A successfully refreshed from Google Patents.
US3900508A
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Perfluoroalkylsulfonic acid aminophenyl esters
Assignee: Bayer AG
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Filing: 1973-11-30
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Granted: 1975-08-19
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Expires: 1993-11-30
Abstract
Abstract Perfluoroalkylsulfonic acid aminophenyl esters of the formula
Inventors
- 👤 Peter Voss
- 👤 Hans Niederprum
- 👤 Volker Beyl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:57
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/63; C07C309/64; C07C309/65; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
9 words
AN AMINOSUBSTITUTED-ARYL ESTER OF PERFLUORALKYLSULFONIC ACID OF THE FORMULA
Claim 2
Dependent Claim
9 words
AN AMINOSUBSTITUTED-ARYL ESTER OF PERFLUORALKYLSULFONIC ACID OF THE FORMULA
Claim 3
Dependent Claim
10 words
An ester according to claim 1 wherein RF is perfluorooctyl.
Claim 4
Dependent Claim
14 words
An ester according to claim 1 wherein such ester is perfluorooctylsulfonic acid 3-aminophenyl ester.
Claim 5
Dependent Claim
13 words
An ester according to claim 1 wherein such ester is perfluorooctylsulfonic acid-4-aminophenyl ester.
References Cited (Backward Citations)
US3346612A
Cited
US3458571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |