US3709841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated polyarylethersulfones
Assignee: Rhone Poulenc SA
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Filing: 1970-04-28
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Granted: 1973-01-09
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Expires: 1990-04-28
Abstract
Abstract NOVEL SULPHONATED POLYARYLETHER-SULPHONES ARE USEFUL AS CATION-EXCHANGE RESINS ESPECIALLY FOR ION-EXCHANGE MEMBRANES USEFUL IN OSMOSIS AND REVERSE OSMOSIS.
Inventors
- 👤 J Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:02
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/66; B01D71/68; C; C08; C08G; C08G75/00; C08G75/20; C08G75/23; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2268; C08J2333/00; C08J2333/24; C08J2371/00; C08J2371/08; C08J2371/10; C08J2371/12; C08J2381/00; C08J2381/06
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |