US3582276A
Expired / Lapsed
US
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Process for recovering a metal oxide and sulfur dioxide from metal sulfate
Assignee: Elk Corp
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Filing: 1968-07-22
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Granted: 1971-06-01
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Expires: 1988-07-22
Abstract
Abstract A METAL SULFATE IS CONVERTED TO A METAL OXIDE AND SULFUR DIOXIDE BY SUBJECTING IT TO A SERIES OF REDUCTION AND OXIDATION STEPS. DURING THE REDUCTION STEPS, THE SULFATE PRESENT IS CONVERTED TO SULFUR DIOXIDE, THE METAL SULFIDE AND THE METAL OXIDE. THE SUBSEQUENT OXIDIZING STEP CONVERTS THE METAL SULFIDE TO SULFUR DIOXIDE, METAL OXIDE, AND A SMALL AMOUNT OF METAL SULFATE. THE SULFUR DIOXIDE IS COLLECTED TO ANY SUITABLE MANNER, AND THE REDUCTION AND OXIDATION SYCLE IS REPEATED UNTIL A METAL OXIDE OF DESIRED PURITY IS OBTAINED.
Inventors
- 👤 Roy Edwin Campbell
- 👤 Edwin Eddie Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/02; C01F11/08; C01B; C01B17/00; C01B17/42; C01B17/44; C01B17/48; C01B17/50; C01B17/501; C01B17/506; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |