US3667908A
Expired / Lapsed
US
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Removal and recovery of sulfur oxides from gases
Assignee: Westvaco Corp
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Filing: 1970-11-27
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Granted: 1972-06-06
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Expires: 1990-11-27
Abstract
Abstract A PROCESS FOR REMOVING SULFUR DIOXIDE AND SULFUR TRIOXIDE FROM A GASEOUS STREAM WHEREBY SULFUR DIOXIDE IS OXIDIZED TO A SULFUR TRIOXIDE AND THE SULFUR TRIOXIDE IS ADSORBED ONTO AN ACTIVATED CARBON ADSORBENT HAVING ELEMENTAL SULFUR ADSORBED THEREON; THEREAFTER THE ADSORBENT IS REENERATED PRODUCING SULFUR DIOXIDE AND ACTIVATED CARBON ADSORBENT WITH A MINIMAL LOSS OF ADSORBENT DUE TO BURNOFF; ELEMENTAL SULFUR IS ADSORBED ONTO THE REGENEATED ADSORBENT AND THE ADSORENT IS THEN RECYCLED TO CONTACT THE GASEOUS STREAM AND THE SULFUR DIOXIDE PRODUCED DURING REGENERATION IS RECOVERED.
Inventors
- 👤 Samuel L Torrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |