US3703573A
Expired / Lapsed
US
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Process for extracting copper,cobalt and nickel values from aqueous solution
Assignee: Shell USA Inc
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Filing: 1971-08-05
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Granted: 1972-11-21
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Expires: 1991-08-05
Abstract
Abstract 4 - ALKYL - 1,2-CYCLOHEXANEDIONE DIOXIMES SELECTIVELY EXTRACT COPPER, COBALT AND NICKEL VALUES FROM AQUEOUS SOLUTIONS OF PH 2-9.
Inventors
- 👤 George C Blytas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:30
CPC Classifications
C; C01; C01G; C01G3/00; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488; C01G53/00; C01G53/01; C22; C22B; C22B15/00; C22B15/0063; C22B3/00; C22B3/20; C22B3/26; C22B3/30; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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 |