US3703451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction and electrowinning of copper
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1971-09-13
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Granted: 1972-11-21
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Expires: 1991-09-13
Abstract
Abstract COPPER IS EXTRACTED FROM DILUTE AQUEOUS SOLUTION BY ADDING EXCESS CHLORIDE, REDUCING DISSOLVED COPPER FROM THE CUPRIC TO THE CUPROUS STATE, E.G. USING SULPHUR DIOXIDE, AND PERFORMING A SOLVENT EXTRACTION OPERATION USING A SOLUTION, IN AN INERT WATER-IMMISCIBLE LIQUID, OF A TRI-(ALKYL OR ARYL)PHOSPHITE AS AN EXTRACTANT. THE COPPER MAY BE RECOVERED BY BACKWASHING THE WATER-IMMISCIBLE PHASE WITH AQUEOUS AMMONIA, AND THEN DEPOSITING THE METAL BY ELECTROLYSIS.
Inventors
- 👤 Thomas Victor Healy
- 👤 Alan Pilbeam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:04
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/12
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |