Patent US3666446A successfully refreshed from Google Patents.
US3666446A
Expired / Lapsed
US
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Process for solvent extraction of metals
Assignee: Pyrites Co Inc
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Filing: 1969-11-12
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Granted: 1972-05-30
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Expires: 1989-11-12
Abstract
Abstract SOLVENT ION EXCHANGE REACTION IN WHICH THE PH OF THE METAL-BEARING LIQUOR IS REGULATED BY AN ION EXCHANGE REACTION WHERE HYDROGEN IONS IN THE AQUEOUS LIQUOR ARE EXCHANGED FOR METAL CATIONS IN AN ION EXTRACT. PROCESS ENABLES LOADING AN ION EXTRACTANT WITH METALS IN THE METAL-BEARING LIQUOR WITHOUT INTERSTAGE PH ADJUSTMENT. THE LOADED ION EXTRACTANT IS TREATED WITH A LIGAND TO STRIP THE EXTRACT AND RENDER IT CAPABLE OF REUSE.
Inventors
- 👤 Lorne F Cook
- 👤 Wallace W Szmokaluk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:36
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/402; C22B3/42; C22B3/28; C22B3/30; C22B3/32; C22B3/38; C22B3/384; C22B3/3846; C22B3/404; C22B3/406; C22B3/41; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |