US3770666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl alcohol copolymer ion exchange membranes
Assignee: Rhone Poulenc SA
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Filing: 1970-10-12
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Granted: 1973-11-06
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Expires: 1990-10-12
Abstract
Abstract ION -EXCHANGE MEMBRANES PARTICULARLY USEFUL FOR DEIONISATION OR ORGANIC SOLVENTS ARE MADE FROM CROSSLINKED VINYL ALCOHOL POLYMERS CONTAINING ION-EXCHANGE GROUPS.
Inventors
- 👤 J Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:19
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08F; C08F8/00; C08F8/14; C08J2331/00; C08J2331/02; C08J2331/04; C08J2339/00; C08J2339/04; C08J2339/08
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |