US3577231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing metal sulfides
Assignee: Mercer Alloys Corp
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Filing: 1968-08-23
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Granted: 1971-05-04
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Expires: 1988-08-23
Abstract
Abstract A PROCESS FOR PRODUCING A CONCENTRATE OF METALLIC SULFIDES (ESPECIALLY NICKEL SULFIDE, COPPER SULFIDE AND COBALT SULFIDE) FROM METALLIC SCRAP MATERIALS. THE SCRAP MATERIALS ARE MELTED UNDER A REDUCING ATMOSPHERE AND INJECTED WITH SULFUR-BEARING MATERIAL DURING THE POURING OF THE MOLTEN MATERIAL FROM THE MELTING FURNACE TO A LADLE. THEREAFTER, THE MOLTEN MIXTURE OF SULFIDES IS RAPIDLY COOLED AND SUBSDIVIDED TO PRODUCE A HOMOGENEOUS, FRIABLE, SYNTHETIC ORE.
Inventors
- 👤 Marvin Pesses
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:58
CPC Classifications
C; C01; C01G; C01G1/00; C01G1/12; C22; C22B; C22B15/00; C22B15/0002; C22B15/001; C22B15/0026; C22B15/0056; C22B23/00; C22B23/02; C22B23/025; 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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |