Patent US3348975A successfully refreshed from Google Patents.
US3348975A
Expired / Lapsed
US
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Process for preparing fuel cell electrode containing 45% of a waterproofing agent
Assignee: Wyeth Holdings LLC
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Filing: 1964-08-26
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Granted: 1967-10-24
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Expires: 1984-08-26
Abstract
Abstract 1,049,004. Fuel cells. AMERICAN CYANAMID CO. June 24, 1965 [Aug. 26, 1964], No. 26838/65. Heading H1B. A fuel cell electrode is prepared by spraycoating a suitable catalyst, a water-proofing agent and a water-soluble extender in aqueous mixture on a substrate, drying and calendering followed by activating which involves removing the extender and also removing any soluble lubricant applied before the calendering step The addition of a lubricant before calendering is mandatory but a conductive lubricant, e.g. graphite, may be left in the electrode and may even be added in the spray-coating step. A platinum catalyst and p.t.f.e. as the waterproofer are preferred.
Inventors
- 👤 Ziering Lance Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8825; H01M4/886; H01M4/8663; H01M4/8668; H01M4/8867; H01M4/8871; H01M4/8878; H01M4/8882; H01M4/8892; H01M4/8896; H01M4/90; H01M4/92; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PREPARATION OF AN ELECTRODE ADAPTED FOR USE IN A FUEL CELL, THE IMPROVEMENT WHICH COMPRISES THE SEQUENTIAL STEPS OF: (A) SPRAY COATING ON A SCREEN SUBSTRATE AN AQUEOUS CATALYST MIXTURE COMPRISING A CATALYST, WATER-PROOFING AGENT AND A WATER SOLUBLE EXTENDER WHEREBY A STRUCTURALLY WEAK COMPOSITE IS FORMED; (B) DRYING THE LATER COMPOSITE TO REMOVE WATER THEREFROM AT A TEMPERATURE BETWEEN ABOUT 50*C. AND 100*C.,; (C) SPRAY COATING MINERAL OIL LUBRICANT ON SAID DRIED COMPOSITE; (D) CALENDERING SAID LUBRICATED COMPOSITE TO PROVIDE GOOD STRUCTURAL STRENGHT TO SAID COMPOSITE; AND (E) ACTIVATING THE SO-CALENDERED COMPOSITE BY THE REMOVAL THEREFROM OF THE WATER SOLUBLE EXTENDER AND THE SAID MINERAL OIL.
Claim 2
Dependent Claim
109 words
IN THE PREPARATION OF AN ELECTRODE ADAPTED FOR USE IN A FUEL CELL, THE IMPROVEMENT WHICH COMPRISES THE SEQUENTIAL STEPS OF: (A) SPRAY COATING ON A SCREEN SUBSTRATE AN AQUEOUS CATALYST MIXTURE COMPRISING A CATALYST, WATER-PROOFING AGENT AND A WATER SOLUBLE EXTENDER WHEREBY A STRUCTURALLY WEAK COMPOSITE IS FORMED; (B) DRYING THE LATER COMPOSITE TO REMOVE WATER THEREFROM AT A TEMPERATURE BETWEEN ABOUT 50*C. AND 100*C.,; (C) SPRAY COATING MINERAL OIL LUBRICANT ON SAID DRIED COMPOSITE; (D) CALENDERING SAID LUBRICATED COMPOSITE TO PROVIDE GOOD STRUCTURAL STRENGHT TO SAID COMPOSITE; AND (E) ACTIVATING THE SO-CALENDERED COMPOSITE BY THE REMOVAL THEREFROM OF THE WATER SOLUBLE EXTENDER AND THE SAID MINERAL OIL.
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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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |