US3796568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame smelting and refining of copper
Assignee: Union Carbide Industrial Gases Technology Corp
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Filing: 1971-12-27
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Granted: 1974-03-12
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Expires: 1991-12-27
Abstract
Abstract A FREE-FLOWING SLURRY OF COPPER PRECIPITATE IN A LIQUID HYDROCARBON FUEL IS FED TOGETHER WITH AN OXYGEN CONTAINING GAS INTO THE INTERNAL COMBUSTION ZONE OF A SLURRY BURNER UNDER PRESELECTED CONDITIONS OF FLAME TEMPERATURE AND OXYGEN TO FUEL RATIO SUCH THAT THE IMPURITIES IN THE COPPER PERCIPITATE ARE OXIDIZED AND/OR VAPORIZED IN THE FLAME, WHILE THE COPPER IS MELTED. THE MOLTEN COPPER IS COLLECTED IN A FLUID SLAG COVERED POOL AND THE REMAINING IMPURITIES WHICH ARE OXIDES INSOLUBLE IN THE COPPER ARE SEPARATED BY BENG RETAINED IN THE SLAG LAYER.
Inventors
- 👤 A Szekely
- 👤 P Wrampe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:59
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/006; 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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |