US3423248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas diffusion electrode for electrochemical fuel cells and method of making same
Assignee: BBC Brown Boveri AG Germany
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Filing: 1964-09-14
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Granted: 1969-01-21
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Expires: 1984-09-14
Abstract
No abstract record available.
Inventors
- 👤 Heinz-Gunther Plust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:53
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A GAS DIFFUSION ELECTRODE CONSISTING ESSENTIALLY OF A SKELETON OF A CATALYTICALLY ACTIVE METAL CONTAINING NONMETALLIC HIGH MELTING GRAINS HAVING A MEAN DIAMETER BETWEEN 5 AND 80$ EMBEDDED THEREIN AND INTERCOMMUNICATING PORES, THE PORES BEING SEPARATED FROM SAID GRAINS BY A LAYER OF SKELETON METAL OF ESSSENTIALLY CONSTANT THICKNESS OF FROM 1 TO 30$, WHILE ADJACENT GRAINS ARE INTERCONNECTED BY BRIDGES OF SKELETON METAL, SAID SKELETON HAVING A POROSITY OF AT LEAST ABOUT 30%.
Claim 2
Dependent Claim
74 words
A GAS DIFFUSION ELECTRODE CONSISTING ESSENTIALLY OF A SKELETON OF A CATALYTICALLY ACTIVE METAL CONTAINING NONMETALLIC HIGH MELTING GRAINS HAVING A MEAN DIAMETER BETWEEN 5 AND 80$ EMBEDDED THEREIN AND INTERCOMMUNICATING PORES, THE PORES BEING SEPARATED FROM SAID GRAINS BY A LAYER OF SKELETON METAL OF ESSSENTIALLY CONSTANT THICKNESS OF FROM 1 TO 30$, WHILE ADJACENT GRAINS ARE INTERCONNECTED BY BRIDGES OF SKELETON METAL, SAID SKELETON HAVING A POROSITY OF AT LEAST ABOUT 30%.
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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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |