Patent US2185168A successfully refreshed from Google Patents.
Patent US3567520A successfully refreshed from Google Patents.
US3567520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing electrodes of fuel cells
Assignee: Air Liquide SA
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Filing: 1967-09-28
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Granted: 1971-03-02
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Expires: 1987-09-28
Abstract
Abstract PROCESS FOR MANUFACTURING ELECTRODES FOR FUEL CELLS, WHEREIN A PASTE, COMPRISING A MECHANICALLY RESISTANT MATERIAL IN THE DRY STATE, A SOLVENT FOR THIS MATERIAL AND POSSIBLY AN OXIDATION OR REDUCTION CATALYST OR A COMPONENT CAPABLE OF GENERATING SUCH A CATALYST, IS SUBJECTED TO A FREEZE-DRYING IN WHICH AT LEAST ONE OF THE OPERATIONS OF FREEZING AND SUBLIMATION IS EFFECTED AT A SUFFICIENTLY VARIABLE SPEED, FOR THERE TO BE FORMED A MATERIAL HAVING PORES OF VARIABLE SIZE OVER ITS THICKNESS, AND VARIABLE CONCENTRATIONS OF THE CATALYST OR OF THE COMPONENT CAPABLE OF GENERATING IT.
Inventors
- 👤 Francis Dennery
- 👤 Gerard Mondain-Monval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8803; H01M4/8807; B; B01; B01J; B01J37/00; B01J37/32; B22; B22F; B22F3/00; B22F3/22; B22F3/222; H01M4/8605; H01M4/861; H01M4/8636; H01M4/8642; H01M4/8817; H01M8/00; H01M8/02; H01M8/0202; H01M8/023; H01M8/0241; H01M8/0245; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |