US3761249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper extraction from ammoniacal solutions
Assignee: Canadian Patents and Development Ltd
•
Filing: 1971-03-04
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Granted: 1973-09-25
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Expires: 1991-03-04
Abstract
Abstract THE INVENTION RELATES TO A SOLVENT EXTRACTION PROCESS FOR SEPARATING DISSOLVED COPPER FROM AN AQUEOUS AMMONIACAL SOLUTION ALSO CONTAINING DISSOLVED COBALT AND NICKEL, THE SOLUTION HAVING A CONCENTRATION OF AT LEAST 50 GRAMS AMMONIUM SALT PER LITRE. THE PROCESS COMPRISES CONTACTING SAID AQUEOUS SOLUTION AT PH 6.5 TO 8.5 WITH AN A-HYDROXY OXIME WHEREBY THE COPPER VALUES ARE EXTRACTED FROM THE AQUEOUS PHASE INTO THE ORGANIC PHASE, AND SEPARATING THE RESULTANT COPPER LOADED ORGANIC PHASE FROM THE REMAINING AQUEOUS RAFFINATE PHASE CONTAINING THE COBALT AND NICKEL IN SOLUTION.
Inventors
- 👤 G Ritcey
- 👤 B Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/14; C22; C22B; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |