US3583891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-tight diaphragms for electrochemical cells
Assignee: Siemens AG
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Filing: 1968-05-22
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Granted: 1971-06-08
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Expires: 1988-05-22
Abstract
Abstract DESCRIBED IS A GAS-TIGHT DIAPHRAGM MATERIAL OF HIGH MECHANICAL STABILITY COMPRISED OF FIBROUS MATERIAL AND A SYNTHETIC BINDER. THE MATERIAL IS CHARACTERIZED BY THE FACT THAT THE BINDER THEREFOR CONSISTS OF A COPOLYMER PRODUCED BY THE SAPONIFICATION OF THE NITRILE GROUPS OF A BUTADIENE/ STYRENE/ACRYLONITRILE PRECURSOR AND THAT THE CONTENT OF THE BINDER IS FROM 6 TO 15% BY WEIGHT AND PARTICULARLY 8 TO 12% RELATIVE TO THE WEIGHT OF THE FIBER MATERIAL.
Inventors
- 👤 Heinz Hacker
- 👤 Hans Pokorny
- 👤 Reinhold Tussing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:31
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; B01D69/148; C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/42; H01M50/431; H01M50/44; H01M50/489; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |