US3674463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous gas-atomized copper smelting and converting
Assignee: Newmont Exploration Ltd
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Filing: 1970-08-04
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Granted: 1972-07-04
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Expires: 1990-08-04
Abstract
Abstract A PROCESS FOR SMELTING COPPER SULFIDE CONCENTRATES AND SIMULTANEOUSLY CONVERTING THE THUS-PRODUCED MATTE TO FORM BLISTER COPPER, SLAG AND AN EFFLUENT GAS UNUSUALLY RICH IN SULFUR DIOXIDE IS CHARACTERIZED BY CONTINUOUS OPERATION IN WHICH BOTH SMELTING AND CONVERTING ARE CARRIED OUT IN SUSPENSION OVER A COMMON FURNACE HEARTH BODY OF MOLTEN BLISTER COPPER, MATTE AND SLAG FROM WHICH THE MATTE TO BE CONVERTED IS SUPPLIED.
Inventors
- 👤 John C Yannopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:49
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0047
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |