US2863810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electrowinning zinc
Assignee: American Smelting and Refining Co
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Filing: 1957-03-26
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Granted: 1958-12-09
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Expires: 1977-03-26
Abstract
No abstract record available.
Inventors
- 👤 John J Henderson
- 👤 Harry L Montague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:34
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN A PROCESS FOR ELECTROWINNING ZINC BY ELECTRODEPOSITING ZINC FROM A ZINC ELECTROLYTE, THE MAJOR NONAQUEOUS CONSTITUENTS OF SAID ELECTROLYTE BEING SUBSTANTIAL QUANTITIES OF SULFURIC ACID AND ZINC SULFATE, AND WHICH INVOLVES THE USE OF INSOLUBLE ANODES COMPRISED OF LEAD, THE IMPROVEMENT WHICH COMPRISES COATING ANODES FOR THE PROCESS WITH A COATING OF MANGANESE DIOXIDE PRIOR TO THEIR USE IN THE ZINC ELECTRODEPOSITION STEP, SAID COATING BEING A LAYER OF MANGANESE DIOXIDE APPLIED AT LEAST ON THAT PORTION OF THE ANODE SURFACE WHICH IS TO BE IMMERSED IN SAID ELECTROLYTE DURING SAID ZINC ELECTRODEPOSITION STEP.
Claim 2
Dependent Claim
95 words
IN A PROCESS FOR ELECTROWINNING ZINC BY ELECTRODEPOSITING ZINC FROM A ZINC ELECTROLYTE, THE MAJOR NONAQUEOUS CONSTITUENTS OF SAID ELECTROLYTE BEING SUBSTANTIAL QUANTITIES OF SULFURIC ACID AND ZINC SULFATE, AND WHICH INVOLVES THE USE OF INSOLUBLE ANODES COMPRISED OF LEAD, THE IMPROVEMENT WHICH COMPRISES COATING ANODES FOR THE PROCESS WITH A COATING OF MANGANESE DIOXIDE PRIOR TO THEIR USE IN THE ZINC ELECTRODEPOSITION STEP, SAID COATING BEING A LAYER OF MANGANESE DIOXIDE APPLIED AT LEAST ON THAT PORTION OF THE ANODE SURFACE WHICH IS TO BE IMMERSED IN SAID ELECTROLYTE DURING SAID ZINC ELECTRODEPOSITION STEP.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |