US3284238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel gel compositions and methods for preparation thereof
Assignee: Wyeth Holdings LLC
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Filing: 1963-04-03
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Granted: 1966-11-08
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Expires: 1983-04-03
Abstract
No abstract record available.
Inventors
- 👤 Malcolm L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; B; B01; B01J; B01J47/00; B01J47/018; C08J2309/00; C08J2309/02; C08J2427/00; C08J2427/02; C08J2427/12; C08J2427/18; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A GASEOUS FUEL CELL COMPOSED OF ELECTRODES, A MEMBRANE AND A GAS INLET AND OUTLET, THE IMPROVEMENT IN WHICH SAID MEMBRANE COMPRISES A UNIFORMLY HYDROPHILIC, CROSS-LINKED, WATER-INSOLUBLE GEL OF A NORMALLY WATERSOLUBLE, GELABLE POLYMER AS THE MATRIX, HAVING ION-EXCHANGE MATERIAL, WHICH IS DIFFERENT FROM SAID GEL, OCCLUDED THEREIN.
Claim 2
Dependent Claim
49 words
IN A GASEOUS FUEL CELL COMPOSED OF ELECTRODES, A MEMBRANE AND A GAS INLET AND OUTLET, THE IMPROVEMENT IN WHICH SAID MEMBRANE COMPRISES A UNIFORMLY HYDROPHILIC, CROSS-LINKED, WATER-INSOLUBLE GEL OF A NORMALLY WATERSOLUBLE, GELABLE POLYMER AS THE MATRIX, HAVING ION-EXCHANGE MATERIAL, WHICH IS DIFFERENT FROM SAID GEL, OCCLUDED THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |