Patent US2993778A successfully refreshed from Google Patents.
US2993778A
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US
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Process for roasting a sulfur mineral with the production of sulfur dioxide
Assignee: BASF SE
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Filing: 1957-11-27
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Granted: 1961-07-25
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Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Johannsen Adolf
- 👤 Danz Willi
- 👤 Pfannmueller Wilhelm
- 👤 Wolf Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:52
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/52; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A ONE-STAGE PROCESS FOR THE PRODUCTION OF GASES CONTAINING SULFUR DIOXIDE FROM A SULFIDIC ORE WHICH COMPRISES: ROASTING A SULFUR MINERAL CONTAINING MORE THAN ABOUT 30% BY WEIGHT OF PARTICLES HAVING A DIAMETER OF LESS THAN 0.1 MM. IN A SINGLE SUBSTANTIALLY UNIFORM FLUIDIZED BED OF ROASTED MINERAL AND MINERAL UNDERGOING ROASTING, MAINTAINING THE HEIGHT OF SAID BED BELOW A MAXIMUM OF ABOUT 100 CENTIMETERS WHEN MEASURED IN THE QUIESCENT STATE, SAID BED HAVING A SUPERIMPOSED FREEBOARD SPACE, CARRYING OUT THE ROASTING AT A BED TEMPERATURE BELOW THE SOFTENING POINT OF SAID ROASTED ORE, AND INTRODUCING OXYGEN-CONTAINING GAS INTO SAID FREEBOARD SPACE AND ADJACENT THE UPPER SURFACE OF SAID BED TO ROAST INCOMPLETELY ROASTED MINERAL FINES ENTRAINED IN THE ROASTER GAS LEAVING THE BED, AND INTERRUPTING THE FLOW OF SAID
Claim 2
Dependent Claim
130 words
A ONE-STAGE PROCESS FOR THE PRODUCTION OF GASES CONTAINING SULFUR DIOXIDE FROM A SULFIDIC ORE WHICH COMPRISES: ROASTING A SULFUR MINERAL CONTAINING MORE THAN ABOUT 30% BY WEIGHT OF PARTICLES HAVING A DIAMETER OF LESS THAN 0.1 MM. IN A SINGLE SUBSTANTIALLY UNIFORM FLUIDIZED BED OF ROASTED MINERAL AND MINERAL UNDERGOING ROASTING, MAINTAINING THE HEIGHT OF SAID BED BELOW A MAXIMUM OF ABOUT 100 CENTIMETERS WHEN MEASURED IN THE QUIESCENT STATE, SAID BED HAVING A SUPERIMPOSED FREEBOARD SPACE, CARRYING OUT THE ROASTING AT A BED TEMPERATURE BELOW THE SOFTENING POINT OF SAID ROASTED ORE, AND INTRODUCING OXYGEN-CONTAINING GAS INTO SAID FREEBOARD SPACE AND ADJACENT THE UPPER SURFACE OF SAID BED TO ROAST INCOMPLETELY ROASTED MINERAL FINES ENTRAINED IN THE ROASTER GAS LEAVING THE BED, AND INTERRUPTING THE FLOW OF SAID
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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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |