US3755550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reduction of so2
Assignee: EIDP Inc
•
Filing: 1971-08-02
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Granted: 1973-08-28
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Expires: 1991-08-02
Abstract
Abstract THIS INVENTION RELATES TO THE INITIAL CATALYTIC REDUCTION OF SULFUR DIOXIDE TO HYDROGEN SULFIDE WITH A REDUCING GAS WHEREIN THE CATALYTIC MATERIAL IS ON A SUPPORT AND THE MATERIAL IS A COMBINATION OF (1) ALKALINE EARTH MOLYBDATES AND (2) A CHROMITE SELECTED FROM THE GROUP OF THE CHROMITES OF COBALT, MANGANESE, COPPER, CERIUM, OR A MIXTURE OF THE RATE EARTHS CONTAINING AT LEAST 30% CERIUM. SPACE VELOCITIES OF AT LEAST 500 UP TO OVER 4000 HR.-1 AT LIGHT-OFF TEMPERATURES OF LESS THAN 540*C. WITH THE GASES REACHING EQUILIBRIUM ARE PRACTICAL.
Inventors
- 👤 A Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:22
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478; C01B17/0486; C01B17/16; C01B17/164
Claims Analysis
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |