US3709977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of so2 from gas streams
Assignee: Chemical Construction Corp
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Filing: 1970-11-16
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Granted: 1973-01-09
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Expires: 1990-11-16
Abstract
Abstract SULFUR DIOXIDE IS REMOVED FROM A GAS STREAM WHICH ALSO CONTAINS SULFUR TRIOXIDE, BY CONTACTING THE GAS STREAM WITH A SOLID BASIC ION EXCHANGE RESIN. THE GAS STREAM IS INITIALLY CONTACTED WITH AN ALKALI PRIOR TO CONTACT WITH THE RESIN, TO REMOVE SULFUR TRIOXIDE, AND PREVENT SULFUR TRIOXIDE ADSORPTION BY THE RESIN, WHICH WOULD DEPLETE RESIN ACTIVITY AND RESULT IN A TIGHTLY BOUND CHEMICAL UNION WHICH PREVENTS RESIN REGENERATION BY SIMPLE THERMAL MEANS. D R A W I N G
Inventors
- 👤 Fisher J Villiers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01J; B01J41/00; B01J41/04; 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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |