Patent US3829466A successfully refreshed from Google Patents.
US3829466A
Expired / Lapsed
US
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Perfluoroalkanesulphonamides
Assignee: Bayer AG
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Filing: 1972-10-26
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Granted: 1974-08-13
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Expires: 1992-10-26
Abstract
Abstract PERFLUOROALKANESULPHONAMIDES OF THE FORMULA RF-(CH2-CH2)M-SO2-N(-R1)-(A-N(-SO2-(CH2-CH2)M-RF))(N-1)-A- N(-R2)-SO2-(CH2-CH2)M-RF IN WHICH RF, A, R1, R2, N AND M HAVE THE MEANING GIVEN IN THE DISCLOSURE BELOW, A PROCESS FOR THEIR MANUFACTURE AND THEIR USE AS OLEOPHOBIC AGENTS.
Inventors
- 👤 A Staffe
- 👤 K Gerlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:53
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/438; C; C07; C07C; C07C311/00; C07C311/01; C07C311/02; C07C311/09; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/58; B; B27; B27K; B27K3/00; B27K3/02; B27K3/15
Claims Analysis
Total Claims: 0
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |