US3681056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for winning metals
Assignee: AMERICAN REFINING Ltd
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Filing: 1969-04-21
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Granted: 1972-08-01
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Expires: 1989-04-21
Abstract
Abstract METAL VALUES ARE BROUGHT INTO AQUEOUS SOLUTION BY MILLING AND/OR LEACHING TECHNIQUES. THE RESULTING METALBEARING SOLUTION IS CONTACTED WITH POLYSACCHARIDE COMPLEXING AGENTS TO COMPLEX THE METAL VALUES CARRIED THEREBY. METAL-ORGANIC COMPLEXES ARE RECOVERED AND ARE TREATED BY SMELTING AND/OR ELECTROLYTIC TECHNIQUES TO RECOVER SUBSTANTIALLY PURE METALS.
Inventors
- 👤 Lloyd B Lyon
- 👤 Paul A Little
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:16
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/15
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |