US3785944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrometallurgical process for the production of copper
Assignee: Duval Corp
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Filing: 1971-10-07
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Granted: 1974-01-15
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Expires: 1991-10-07
Abstract
Abstract A HYDROMETALLURGICAL PROCESS FOR POLLUTION-FREE RECOVERY OF METALLIC COPPER FROM CHALCOPYRITE AND OTHER COPPER-CONTAINING MATERIALS BY (A) FERRIC CHLORIDE OXIDATION THEREOF TO PRODUCE CUPRIC CHLORIDE, (B) REDUCTION OF THE CUPRIC CHLORIDE TO CUPROUS CHLORIDE, (C) RECOVERY OF METALLIC COPPER, PREFERABLY BY ELECTRLYSIS, AND (D) REGENERATION OF THE FERRIC CHLORIDE BY OXIDATION WITH CONCURRENT PURGE OF EXCESS IRON AS WELL AS SULFATE IONS AND OTHER IMPURITIES. THE PROCESS IS AMENABLE TO STEADY STATE CYCLIC OPERATION, AND STAGES (D) AND (A) MAY ADVANTAGEOUSLY BE COMBINED.
Inventors
- 👤 G Atwood
- 👤 C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:27
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0069; C22B15/0084; C22B15/0089; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |