Patent US5317212A successfully refreshed from Google Patents.
Patent US3810968A successfully refreshed from Google Patents.
US3810968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing sulfur dioxide from ammonium sulfate
Assignee: IFP Energies nouvelles
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Filing: 1972-05-23
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Granted: 1974-05-14
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Expires: 1992-05-23
Abstract
Abstract AMMONIUM SULFATE IS A MATERIAL OF LOW INDUSTRIAL VALUE WHICH CONNOT BE REJECTED WITHOUT RISK OF WATER POLLUTION. THIS MATERIAL IS CONVERTED TO USEFUL COMPOUNDS, SO2 AND NH3, BY THE PRESENT PROCESS WHICH COMPRISES REACTING AT LEAST STOICHIOMETRICAL PROPORTIONS OF A REDUCING AGENT AND AMMONIUM SULFATE AT 150-400*C. THE REDUCING AGENT MAY BE SULFUR, HYDROGEN SULFIDE, AMMONIUM THIOSULFATE OR CARBON MONOXIDE.
Inventors
- 👤 P Renault
- 👤 A Deschamps
- 👤 C Dezael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:39
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/501; C01B17/504; C01C; C01C1/00; C01C1/02; C01C1/026; C01C1/028
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |