Patent US3238068A successfully refreshed from Google Patents.
US3238068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of porous nonwetting electrodes
Assignee: Allis Chalmers Corp
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Filing: 1962-03-07
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Granted: 1966-03-01
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Expires: 1982-03-07
Abstract
No abstract record available.
Inventors
- 👤 Allen J Hipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:44
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8803; H01M4/8807; H01M4/8817; H01M4/8821; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD OF MAKING A POROUS NONWETTING ELECTRODE FOR USE IN FUEL CELLS AND THE LIKE COMPRISING: IMMERSING AN ELECTRICALLY CONDUCTIVE POROUS ELECTRODE BASE INTO A FIRST SOLUTION CONTAINING A COMPOUND WHICH IS CONVERTIBLE INTO A GASEOUS PHASE AT A TEMPERATURE BELOW 350-380*C.; DRYING SAID ELECTRODE BASE WITH SAID FIRST SOLUTION ABSORBED THEREIN; COATING SAID DRIED ELECTRODE WITH POLYTETRAFLUOROETHYLENE; HOLDING SAID COATED BASE AT ROOM TEMPERATURE WHILE SAID JPOLYTETRAFLUOROETHYLENE FILMS; AND RAPIDLY HEATING SAID FILM COVERED BASE TO THE SINTERING TEMPERATURE OF SAID FILM WHEREUPON SAID COMPOUND CONVERTS TO A GASEOUS PHASE WHICH PASSES OUT OF SAID BASE THROUGH SAID FILM TO RUPTURE SAID FILM AND SAID FILM SINTERS TO MAINTAIN THE POROSITY CREATED BY THE RUPTURING PASSAGE OF SAID PASSES PLATE THERETHROUGH.
Claim 2
Independent Claim
123 words
A METHOD OF MAKING A POROUS NONWETTING ELECTRODE FOR USE IN FUEL CELLS AND THE LIKE COMPRISING: IMMERSING AN ELECTRICALLY CONDUCTIVE POROUS ELECTRODE BASE INTO A FIRST SOLUTION CONTAINING A COMPOUND WHICH IS CONVERTIBLE INTO A GASEOUS PHASE AT A TEMPERATURE BELOW 350-380*C.; DRYING SAID ELECTRODE BASE WITH SAID FIRST SOLUTION ABSORBED THEREIN; COATING SAID DRIED ELECTRODE WITH POLYTETRAFLUOROETHYLENE; HOLDING SAID COATED BASE AT ROOM TEMPERATURE WHILE SAID JPOLYTETRAFLUOROETHYLENE FILMS; AND RAPIDLY HEATING SAID FILM COVERED BASE TO THE SINTERING TEMPERATURE OF SAID FILM WHEREUPON SAID COMPOUND CONVERTS TO A GASEOUS PHASE WHICH PASSES OUT OF SAID BASE THROUGH SAID FILM TO RUPTURE SAID FILM AND SAID FILM SINTERS TO MAINTAIN THE POROSITY CREATED BY THE RUPTURING PASSAGE OF SAID PASSES PLATE THERETHROUGH.
References Cited (Backward Citations)
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |