US2769775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte for copper refining, including polyvinyl alcohol
Assignee: Canadian Copper Refiners Ltd
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Filing: 1953-12-01
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Granted: 1956-11-06
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Expires: 1973-12-01
Abstract
No abstract record available.
Inventors
- 👤 John H Schloen
- 👤 Eugene M Elkin
- 👤 Ekler Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:54
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
IN EHT ELECTROLYTIC REFINING OF COPPER, INVOLVING PASSING AN ELECTRIC CURRENT BETWEEN ANODES OF COPPER TO BE REFINED AND CATHODE OF PURE COPPER IMMERSED IN AN ELECTROLYTE COMPRISING AN AQUEOUS SOLUTION OF CUPRIC SULPHATE AND SULPHURIC ACID, THE IMPROVEMENT WHICH COMPRISES ADDING TO SAID ELECTROLYTE FROM ABOUT 0.025 TO ABOUT 0.08 POUND OF GLUE AND FROM ABOUT 0.02 TO ABOUT 0.14 POUND OF POLYVINYL ALCOHOL FOR EACH TON OF COPPER DEPOSITED ON THE CATHODES.
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |