US3741945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl alcohol copolymers containing hydroxy sulfonyl groups
Assignee: Rhone Poulenc SA
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Filing: 1971-08-27
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Granted: 1973-06-26
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Expires: 1991-08-27
Abstract
Abstract VINYL ALCOHOL COPOLYMERS PARTIALLY ETHERIFIED WITH HYDROXY SULPHONYL ORGANIC RADICALS AND OPTIONALLY PARTIALLY CROSSLINKED BY ETHER GROUPS ARE USEFUL IN MAKING CATIONEXCHANGE MEMBRANES.
Inventors
- 👤 G Bourat
- 👤 R Margraff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:11
CPC Classifications
C; C08; C08F; C08F8/00
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |