US3793432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrometallurgical treatment of nickel group ores
Assignee: Individual
•
Filing: 1972-01-27
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Granted: 1974-02-19
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Expires: 1992-01-27
Abstract
Abstract A PROCESS FOR THE LEACHING OF NICKEL BEARING LATERITES, BENEFICIATED LATERITES OR OTHER NICKEL BEARING PRODUCTS WHEREIN THE LEACH IS CONDUCTED AT A TEMPERATURE BELOW THE ATMOSPHERIC BOILING POINT OF THE PULP AND NICKEL AND COBALT ARE EFFECTIVELY DISSOLVED WHILE IRON IS PREVENTED FROM REMAINING IN SOLUTION THROUGH THE USE OF PRECIPITATING AGENTS CAPABLE OF INTRODUCING ALKALI METAL ION OR AMMONIA ION TO THE PULP.
Inventors
- 👤 D Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:17
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |