US3563704A
Expired / Lapsed
US
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Removal and recovery of sulfur oxides from gases
Assignee: Westvaco Corp
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Filing: 1968-08-13
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Granted: 1971-02-16
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Expires: 1988-08-13
Abstract
Abstract A PROCESS FOR REMOVING SULFUR OXIDES FROM GAS STREAMS WHEREBY THE SULFUR OXIDES ARE ADSORBED ONTO A CARBONACEOUS ADSORBENT AND RECOVERING SULFUR DIOXIDE FROM THE SPENT ADSORBENT BY CONTACTING THE ADSORBENT WITH AN OXIDE-REDUCING GAS, I.E., HYDROGEN SULFIDE, WHEREBY THE ADSORBED SULFUR OXIDES HAVING BEEN ADSORBED AS SULFURIC ACID AND SULFUR TIOXIDE ARE REDUCED TO SULFUR DIOXIDE AND ELEMENTAL SULFUR, THEN REMOVING THE ELE- MENTAL SULFUR FROM THE ADSORBENT BY CONTACTING WITH A SULFUR-REDUCING GAS AND THEREAFTER RECYLCING THE ADSORBENT.
Inventors
- 👤 Samuel L Torrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0473; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/30; B01D2257/302; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086; B01D2259/40088; B01D53/06; B01D53/10; B01D53/12
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |