Patent US2699375A successfully refreshed from Google Patents.
US2699375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of gases containing sulfur dioxide
Assignee: BASF SE
•
Filing: 1951-03-13
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Granted: 1955-01-11
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Expires: 1971-03-13
Abstract
No abstract record available.
Inventors
- 👤 Johannsen Adolf
- 👤 Danz Willi
- 👤 Fees Karl
- 👤 Kammerer Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:24
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN THE PROCESS FOR THE PRODUCTION OF GASES CONTAINING SULFUR DIOXIDE BY ROASTING SULFIDE-CONTAINING IRON ORE IN A LAYER OF ROASED MATERIAL WHICH IS MAINTAINED IN A FLUIDIZED BED BY MEANS OF THE OXYGEN-CONTAINING GAS NECESSARY FOR THE ROASTING AND BY MEANS OF THE ROASTER GASES FORMED THEREFROM IN THE STRONGLY EXOTHERMIC REACTION, THE STEPS WHICH COMPRISES ROASTING THE LAYER AT A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE RAPID ROASTING IN THE LAYER TO SUCH AN EXTEND THAT THE LAYER CONSIST PREDOMINANTLY OF SUBSTANTIALLY ROASTED PARTICLES, AND MAINTAINING THE TEMPERATURE IN THE LAYER BELOW THE SOFTENING POINT OF THE SUBSTANTIALLY ROASTED MATERIAL BY WITHDRAWING
Claim 2
Dependent Claim
103 words
IN THE PROCESS FOR THE PRODUCTION OF GASES CONTAINING SULFUR DIOXIDE BY ROASTING SULFIDE-CONTAINING IRON ORE IN A LAYER OF ROASED MATERIAL WHICH IS MAINTAINED IN A FLUIDIZED BED BY MEANS OF THE OXYGEN-CONTAINING GAS NECESSARY FOR THE ROASTING AND BY MEANS OF THE ROASTER GASES FORMED THEREFROM IN THE STRONGLY EXOTHERMIC REACTION, THE STEPS WHICH COMPRISES ROASTING THE LAYER AT A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE RAPID ROASTING IN THE LAYER TO SUCH AN EXTEND THAT THE LAYER CONSIST PREDOMINANTLY OF SUBSTANTIALLY ROASTED PARTICLES, AND MAINTAINING THE TEMPERATURE IN THE LAYER BELOW THE SOFTENING POINT OF THE SUBSTANTIALLY ROASTED MATERIAL BY WITHDRAWING
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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) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |