Patent US3734962A successfully refreshed from Google Patents.
US3734962A
Expired / Lapsed
US
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Process for the preparation of hydroxy-alkyl-perfluoroalkane sulfonamides
Assignee: Bayer AG
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Filing: 1971-05-13
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Granted: 1973-05-22
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Expires: 1991-05-13
Abstract
Abstract PREPARATION OF N-HYDROXYALKYL PERFLUOROALKANE SULFONAMIDES BY REACTING THE CORRESPONDING N-UNSUBSTITUTED SULFONAMIDES WITH A CYCLIC CARBONATE OR SULFITE AT A TEMPERATURETURE OF ABOUT 50 TO 250*C. IN THE PRESENCE OF AN INORGANIC OR ORGANIC BASE.
Inventors
- 👤 H Niederpruem
- 👤 P Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:40
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |