US3415686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell electrolyte comprising an alkali metal tungstate
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1963-06-26
•
Granted: 1968-12-10
•
Expires: 1983-06-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Shropshire
- 👤 Barry L Tarmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:58
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A FUEL CELL THE IMPROVEMENT IN COMBINATION THEREWITH COMPRISING AN ELECTROLYTE OF ABOUT 5 TO 50 WT. PERCENT SULFURIC ACID SATURATED WITH AN ALKALI METAL TUNGSTATE AND AN ANODE COMPRISING A PLATINUM SUPPORT HAVING THEREON A LAYER OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM PERRHENATE, POTASSIUM PERRHENATE, RHENIUM TRICHLORIDE, AND RHENIUM HEPTOXIDE.
Claim 2
Dependent Claim
56 words
IN A FUEL CELL THE IMPROVEMENT IN COMBINATION THEREWITH COMPRISING AN ELECTROLYTE OF ABOUT 5 TO 50 WT. PERCENT SULFURIC ACID SATURATED WITH AN ALKALI METAL TUNGSTATE AND AN ANODE COMPRISING A PLATINUM SUPPORT HAVING THEREON A LAYER OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM PERRHENATE, POTASSIUM PERRHENATE, RHENIUM TRICHLORIDE, AND RHENIUM HEPTOXIDE.
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |