US3409472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous plate and method of making same
Assignee: Clevite Industries Inc
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Filing: 1962-08-13
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Granted: 1968-11-05
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Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 Edward P Weber
- 👤 Edward L Thellmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:13
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9041; B; B22; B22F; B22F7/00; B22F7/002; H01M4/8605; H01M4/8621; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A MULTIPLE-POROSITY PLATE USABLE AS A FUEL CELL ELECTRODE COMPRISING A THIN, FINE POROSITY, SINTERED METAL POWDER INNER LAYER FOR CONTACT WITH THE FUEL CELL ELECTROLYTE, A COARSE POROSITY SINTERED METAL POWDER MIDDLE LAYER BONDED TO THE BACK OF SAID INNER LAYER, SAID MIDDLE LAYER HAVING A PLURALITY OF PORTIONS THEREOF WHICH ARE DENSELY COMPACTED AND REGULARLY DISTRIBUTED THROUGHOUT SUBSTANTIALLY THE ENTIRE AREA OF SAID LAYER AND HAVING BETWEEN SAID DENSELY COMPACTED PORTIONS A PLURALITY OF REMAINING PORTIONS OF SUBSTANTIALLY GREATER THICKNESS AND LOWER DENSITY THAN SAID DENSELY COMPACTED PORTIONS, SAID REMAINING PORTIONS OF THE MIDDLE LAYER HAVING GREATER PORE SIZE AND A SUBSTANTIALLY GREATER POROSITY THAN SAID INNER LAYER, SAID MIDDLE LAYER THROUGHOUT ITS EXTENT BEING SUBSTANTIALLY THICKER THAN SAID INNER LAYER, AND A COARSE POROSITY SINTERED METAL POWDER OUTER LAYER BONDED TO THE BACK OF SAID MIDDLE LAYER AND HAVING A POROSITY AND PORE SIZE AT LEAST SUBSTANTIALLY AS GREAT AS SAID REMAINING PORTIONS OF THE LATTER.
Claim 2
Dependent Claim
159 words
A MULTIPLE-POROSITY PLATE USABLE AS A FUEL CELL ELECTRODE COMPRISING A THIN, FINE POROSITY, SINTERED METAL POWDER INNER LAYER FOR CONTACT WITH THE FUEL CELL ELECTROLYTE, A COARSE POROSITY SINTERED METAL POWDER MIDDLE LAYER BONDED TO THE BACK OF SAID INNER LAYER, SAID MIDDLE LAYER HAVING A PLURALITY OF PORTIONS THEREOF WHICH ARE DENSELY COMPACTED AND REGULARLY DISTRIBUTED THROUGHOUT SUBSTANTIALLY THE ENTIRE AREA OF SAID LAYER AND HAVING BETWEEN SAID DENSELY COMPACTED PORTIONS A PLURALITY OF REMAINING PORTIONS OF SUBSTANTIALLY GREATER THICKNESS AND LOWER DENSITY THAN SAID DENSELY COMPACTED PORTIONS, SAID REMAINING PORTIONS OF THE MIDDLE LAYER HAVING GREATER PORE SIZE AND A SUBSTANTIALLY GREATER POROSITY THAN SAID INNER LAYER, SAID MIDDLE LAYER THROUGHOUT ITS EXTENT BEING SUBSTANTIALLY THICKER THAN SAID INNER LAYER, AND A COARSE POROSITY SINTERED METAL POWDER OUTER LAYER BONDED TO THE BACK OF SAID MIDDLE LAYER AND HAVING A POROSITY AND PORE SIZE AT LEAST SUBSTANTIALLY AS GREAT AS SAID REMAINING PORTIONS OF THE LATTER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |