US3793440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction of hydrogen sulphide and sulphur dioxide to form elementary sulphur
Assignee: BASF SE
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Filing: 1972-02-17
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Granted: 1974-02-19
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Expires: 1992-02-17
Abstract
Abstract HYDROGEN SULFIDE IS REACTED WITH SULFUR DIOXIDE OR OXYGEN TO FORM SULFUR IN THE PRESENCE OF CERTAIN SOLVENTS. THESE SOLVENTS ARE SULFOXIDES OF THE GENERAL FORMULA: R1-SO-R2 OR INERT POLAR APROTIC SOLVENTS CONTAINING DISSOLVED THEREIN PHOSPHINE OXIDES OF THE GENERAL FORMULA: (R2)3P=O.
Inventors
- 👤 G Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:29
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |