US3765945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric cells and batteries
Assignee: British Railways Board
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Filing: 1971-11-29
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Granted: 1973-10-16
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Expires: 1991-11-29
Abstract
Abstract An electric cell of the kind in which the electrochemical reactants are liquid sodium as negative active material (anode) and liquid sulphur material as positive active material (cathode) and anode and cathode compartments are separated by a solid electrolyte which is a sodium ion conductor. The cell is assembled in the discharged state and the cathode compartment initially contains sodium poly-sulphide encapsulated in elemental sulphur.
Inventors
- 👤 J Sudworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:41
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
A method of manufacturing an electric cell according to claim 1, wherein the sodium poly-sulphide is impregnated into a matrix of electronically conducting material prior to it being encapsulated in the elemental sulphur.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |