US3364019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fuel cell electrodes
Assignee: Leesona Corp
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Filing: 1965-01-21
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Granted: 1968-01-16
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 William E Houghtby
- 👤 Joseph A David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:47
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8875; B; B22; B22F; B22F7/00; B22F7/002; H01M4/8878; H01M4/8882; H01M4/8896; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF MAKING IMPROVED BI-POROUS ELECTRODES HAVING A WELL-DEFINED INTERFACE BETWEEN THE COARSE AND FINE PORE LAYERS AND CONTROLLED AND REPRODUCIBLE PORE SIZE AND POROSITY COMPRISING THE STEPS OF (1) FORMING A FINE PORE LAYER IN A RETAINER FROM METAL POWDERS HAVING A PARITCLE SIZE OF UP TO 12 MICRON; (2) PLACING A SECOND RETAINER OVER THE FIRST RETAINER AND FILLING SAID SECOND RETAINER WITH A METAL POWDER HAVING A PARTICLE SIZE OF FROM 15 TO 100 MICRONS; (3) COMPACTING SUFFICIENTLY TO SETTLE THE METAL POWDERS WHILE PREVENTING INTERMIXING OF THE POWDER FROM THE FINE PORE LAYER WITH THE POWDER FROM THE COARSE PORE LAYER; AND (4) HEATING SUFFICIENTLY TO BOND THE METAL POWDERS TOGEHTER AND TO MAINTAIN THE WELLDEFINED INTERFACE WITHOUT EXCESSIVE COALESCENCE.
Claim 2
Independent Claim
125 words
THE METHOD OF MAKING IMPROVED BI-POROUS ELECTRODES HAVING A WELL-DEFINED INTERFACE BETWEEN THE COARSE AND FINE PORE LAYERS AND CONTROLLED AND REPRODUCIBLE PORE SIZE AND POROSITY COMPRISING THE STEPS OF (1) FORMING A FINE PORE LAYER IN A RETAINER FROM METAL POWDERS HAVING A PARITCLE SIZE OF UP TO 12 MICRON; (2) PLACING A SECOND RETAINER OVER THE FIRST RETAINER AND FILLING SAID SECOND RETAINER WITH A METAL POWDER HAVING A PARTICLE SIZE OF FROM 15 TO 100 MICRONS; (3) COMPACTING SUFFICIENTLY TO SETTLE THE METAL POWDERS WHILE PREVENTING INTERMIXING OF THE POWDER FROM THE FINE PORE LAYER WITH THE POWDER FROM THE COARSE PORE LAYER; AND (4) HEATING SUFFICIENTLY TO BOND THE METAL POWDERS TOGEHTER AND TO MAINTAIN THE WELLDEFINED INTERFACE WITHOUT EXCESSIVE COALESCENCE.
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) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |