Patent US3575718A successfully refreshed from Google Patents.
US3575718A
Expired / Lapsed
US
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Composite electrolyte member for fuel cell
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1968-09-23
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Granted: 1971-04-20
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Expires: 1988-09-23
Abstract
Abstract THE MATRIX OF ONE LAYER HAS CARBON POWDER AS AN ESSENTIAL COMPONENT. THE SECOND, WHICH IS A THINNER LAYER CONTAINS NO CARBON POWDER, FORMS A DIELECTRIC BARRIER BETWEEN THE CATHODE AND THE LAYER CONTAINING A CARBON-POWDER. THIN FLEXIBLE FUEL CELL ELECTROLYTE MEMBERS, WHICH ALSO SERVE AS EFFECTIVE BARRIERS BETWEEN THE CATHODE AND ANODE COMPARTMENTS IN A FUEL CELL AND WHICH ARE USEFUL FOR FUEL CELLS OPERATING IN THE TEMPERATURE RANGE OF 80*-250* C. ARE COMPOSITE STRUCTURES HAVING TWO DISSIMILAR LAYERS, EACH CONSISTING OF A MATRIX AND A CONCENTRATED LIQUID ACID IMMOBILIZED IN SUCH MATRIX. THE MATRIX OF EACH LAYER IS COMPRISED OF A FLUOROCARBON GEL AND INERT FILLER PARTICLES.
Inventors
- 👤 Otto J Adlhart
- 👤 Virendra V Tanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:57
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0289; H01M8/0293; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |