US3687615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization of flue gas
Assignee: C0NSOLIDATION COAL Co
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Filing: 1971-03-29
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Granted: 1972-08-29
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Expires: 1991-03-29
Abstract
Abstract REMOVAL OF SULFUR DIOXIDE FROM HOT FLUE GAS BY PASSING THE FLUE GAS IN CONTACT WITH POTASSIUM FORMATE, SODIUM FORMATE, OR AMMONIUM FORMATE, IN EITHER A MOLTEN STATE OR IN AQUEOUS SOLUTION, AT A TEMPERATURE ABOVE 140*F., WHEREBY THE SULFUR DIOXIDE AND THE FORMATE REACT TO FORM PRINCIPALLY THIOSULFATE.
Inventors
- 👤 Everett Gorin
- 👤 Paul M Yavorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:25
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |