US3743705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering copper values
Assignee: Zeneca Inc
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Filing: 1971-10-12
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Granted: 1973-07-03
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Expires: 1991-10-12
Abstract
Abstract A PROCESS OF RECOVERING METAL VALUES IS DESCRIBED HEREIN. THE PROCESS INVOLVES THE REACTION OF A SOLUBLE METAL IN SOLUTION WITH HYDROGEN SULFIDE TO FORM SOLID METAL SULFIDE CRYSTALS. A PORTION OF THE METAL SULFIDE IS RECYCLED AND CONTACTED WITH THE HYDROGEN SULFIDE WHICH IS ADSORBED ONTO THE SURFACE OF THE SOLID METAL SULFIDE. WHEN THE SOLUBLE METAL CONTACTS THE ABSORBED HYDROGEN SULFIDE, LARGER METAL SULFIDE CRYSTALS ARE FORMED THAT CAN READILY BE RECOVERED BY THICKENING AND FILTRATION PROCEDURES.
Inventors
- 👤 C Sumner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:05
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/12; B; B01; B01D; B01D21/00; B01D21/10; B01D21/24; B01D21/2488; B01D21/30; B01D21/305
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |