US3674560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing copper sulfide voltaic cell cathodes
Assignee: EIDP Inc
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Filing: 1970-04-08
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Granted: 1972-07-04
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Expires: 1990-04-08
Abstract
Abstract COPPER SULFIDE CATHODES HAVING IMPROVED DISCHARGE CHARACTERISTICS AND INCREASED ELECTROCHEMICAL UTILIZATION OF COPPER SULFIDE CAN BE PREPARED BY REDUCTING, IN A COPPER SULFIDE HAVING A CHEMICALLY BOUND SULFUR TO COPPER RATIO OF AT LEAST 0.94:1, TO LESS THAN 2% THE PORTION OF THE COPPER SULFIDE SUBSTANCE THAT IS EXTRACTABLE BY HOT 0.5 N. AQUEOUS HYDROCHLORIC ACID. HIGHLY EFFECIENT VOLTAIC CELLS CAN BE PRODUCED USING THIS CATHODE STRUCTURE.
Inventors
- 👤 Hanspeter Alder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:32
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/581
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |