Patent US2625464A successfully refreshed from Google Patents.
US2625464A
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Roasting of sulfides
Assignee: Dorr Co
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Filing: 1949-05-24
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Granted: 1953-01-13
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Expires: 1969-05-24
Abstract
No abstract record available.
Inventors
- 👤 Elliott J Roberts
- 👤 Rupert M Foley
- 👤 David F Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:11
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/52; C22; C22B; C22B1/00; C22B1/02; C22B1/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
THE CONTINUOUS PROCESS FOR TREATING FINELY DIVIDED IRON SULFIDE BEARING SOLIDS TO YIELD THEREFROM SULFUR DIOXIDE GAS THAT IS SUBSTANTIALLY FREE FROM BOTH UNCOMBINED SULFUR AND SULFUR TRIOXIDE COMPRISING ESTABLISHING AND MAINTAINING A BED OF SUCH SOLIDS IN A TREATMENT ZONE MAINTAINED AT SOLIDS ROASTING TEMPERATURES, MAINTAINING THE BED AS A TURBULENT FLUIDIZED BED BY PASSING THERETHROUGH AT SOLIDS FLUIDIZING VELOCITIES AN UPRISING STREAM OF FLUIDIZING GAS, ROASTING SOLIDS IN THE BED TO YIELD A GAS CONTAINING BOTH UNCOMBINED SULFUR AND SULFUR-DIOXIDE AS WELL AS TO YIELD ROASTED SOLIDS CONTAINING A MINIMUM OF 2% BY WEIGHT OF SULFIDIC-SULFUR BY MAINTAINING IN THE UPRISING STREAM OF GAS SUPPLIED TO THE BED FREEOXYGEN IN AN AMOUNT SUFFICIENT TO YIELD BOTH SULFUR-DIOXIDE AND UNCOMBINED SULFUR VAPOR BUT INSUFFICIENT TO CONVERT MORE THAN 98% BY WEIGHT OF THE SULFIDIC-SULFUR OF THE BED TO UNCOMBINED SULFUR VAPOR AND SULFUR-DIOXIDE, DISCHARGING ROASTED
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |