US3701650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper,nickel,cobalt and iron separation process
Assignee: Shell USA Inc
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Filing: 1970-06-29
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Granted: 1972-10-31
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Expires: 1990-06-29
Abstract
Abstract COPPER, NICKEL AND COBALT VALUES ARE SLECTIVELY RECOVERED FROM AQUEOUS SOLUTIONS ALSO CONTINING IRON VALUES BY THE PROCESS OF (1) EXTRACTING FROM THE SOLUTION THE COPPER, NICKEL, COBALT AND IRON VALUES EMPLOYING CERTAIN SECONDARY AND TERTIARY CARBOXYLIC ACIDS AS EXTRACTION AGENT AND (2) SELECTIVELY AND SEQUENTIALLY REDUCING THE COPPER VALUE, THE NICKEL VALUE AND FINALLY THE COBALT VALUE PRESENT IN THE ORGANIC EXTRACT TO SEQUENTIALLY ISOLABLE METALLIC PRECIPITATES UNDER CONTROLLED HYDROGEN REDUCTION CONDITIONS.
Inventors
- 👤 Abraham J Van Der Zeeuw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:44
CPC Classifications
C; C01; C01G; C01G1/00; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/30; C22B3/32; 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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |