Patent US3793430A successfully refreshed from Google Patents.
US3793430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrometallurgical treatment of nickel,cobalt and copper containing materials
Assignee: Individual
•
Filing: 1973-05-31
•
Granted: 1974-02-19
•
Expires: 1993-05-31
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 LOW LEVEL. THE LEACHING MAY BE CARRIED OUT AT TEMPERATURES AND PRESSURES BELOW OR ABOVE ATMOSPHEERIC PRESSURE AND THE ATMOSPHERIC BOILING POINT OF THE PULP.
Inventors
- 👤 D Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:10
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0415; C22B23/043; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |