US3798304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-metallurgical treatment of nickel cobalt and copper containing materials
Assignee: Individual
•
Filing: 1972-06-08
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Granted: 1974-03-19
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Expires: 1992-06-08
Abstract
Abstract A PROCESS FOR THE RECOVERY BY LEACHING OF NICKEL COBALT AND COPPER USING SULPHURIC ACID AND EMPLOYING AGENTS CAPABLE OF INTRODUCING ALKALI METAL ION OR AMMONIUM ION TO THE PULP WHEREBY THE DISSOLUTION OF DESIRED METALS IS CONTROLLED AND THE IRON CONTENT OF THE SOLUTION IS REDUCED TO A DESIRED LEVEL. THE LEACHING MAY BE CARRIED OUT AT TEMPERATURES AND PRESSURES BELOW OR ABOVE ATMOSPHERIC PRESSURE AND THE ATMOSPHERIC BOILING POINT OF THE PULP.
Inventors
- 👤 D Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:06
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0415; C22B23/043
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |