US3552921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing sulfur dioxide from hot gas
Assignee: Shell USA Inc
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Filing: 1968-08-28
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Granted: 1971-01-05
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Expires: 1988-08-28
Abstract
Abstract REMOVING SULFUR DIOXIDE FROM HOT GAS THAT CONTAINS SULFUR DIOXIDE AND OXYGEN BY CONTACTING THE GAS WITH A MOLTEN SALT SYSTEM INCLUDING POTASSIUM SULFATE AND POTASSIUM PYROSULFATE AND A THIRD SALT THAT DEPRESSES THE MELTING POINT OF THE SYSTEM, CIRCULATING THE SALT SYSTEM BETWEEN A GAS CONTACTING ZONE AT A MAXIMUM TEMPERATURE OF 550*C. TO A REGENERATING ZONE WHERE THE TEMPERATURE OF THE SYSTEM IS RAISED TO AT LEAST 600*C. TO DRIVE OFF SULFUR TRIOXIDE.
Inventors
- 👤 George C Blytas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507; B01D53/501; C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/775; C01B17/90
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |