US3717699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of gases
Assignee: Gas Council
•
Filing: 1970-05-21
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Granted: 1973-02-20
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Expires: 1990-05-21
Abstract
Abstract SULPHUR IS PRODUCED FROM GASEOUS MIXTURES OF HYDROGEN SULPHIDE AND SULPHUR DIOXIDE BY CONTACT WITH A CATALYST COMPRISING AN OXIDE OF URANIUM PREFERABLY ADMIXED WITH A THORIUM OXIDE AND PREFERABLY DISPOSED ON A CARRIER. IF STEAM TOGETHER WITH CARBON OXYSULPHIDE AND/OR CARBON DISULPHIDE ARE PRESENT, THE CARBON SULPHIDES WILL REACT WITH STEAM IN THE PRESENCE OF THE CATALYST TO YIELD HYDROGEN SULPHIDE. THIS LATTER REACTION MAY TAKE PLACE SIMULTANEOUSLY WITH THE REACTION OF HYDROGEN SULPHIDE AND SULPHUR DIOXIDE.
Inventors
- 👤 T Nicklin
- 👤 F Farrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:37
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0434
Claims Analysis
Total Claims: 0
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |