US3661756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electrolyte refining of metal,such as copper
Assignee: Phelps Dodge Refining Corp
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Filing: 1969-12-16
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Granted: 1972-05-09
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Expires: 1989-12-16
Abstract
Abstract CATHODE FOR ELECTROLYTIC REFINING OF METAL, SUCH AS COPPER, TO PRODUCE CATHODES OF COMMERCE WHEREIN A SUBSTANTIAL THICKNESS OF THE METAL IS ELECTROLYTICALLY DEPOSITED ON BOTH SIDES OF THIN STARTING SHEETS TO PRODUCE INTERMEDIATE CATHODES WHICH AE THEN SUBJECTED TO A PRESSING OPERATION TO STRESS THE METAL OVER THE AREA OF THE INTERMEDIATE CATHODE SHEETS TO COLD WORK THE METAL AND STRESS IT TO BEYOND ITS ELASTIC LIMIT, AFTER WHICH THE METAL IS ELECTROLYTICALLY DEPOSITED ON BOTH SIDES OF THE INTERMEDIATE CATHODE SHEETS TO A THICKNESS SUITABLE FOR METAL CATHODES OF COMMERCE.
Inventors
- 👤 Bill Hugh Spoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; C25C1/00; C25C1/12; C25C7/06
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |