US3798309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering sulfur dioxide from gases using aqueous salt solution of glutaric acid
Assignee: Monsanto Co
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Filing: 1972-07-31
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Granted: 1974-03-19
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Expires: 1992-07-31
Abstract
Abstract GASES CONTAINING SULFUR DIOXIDE, SUCH AS FLUE GASES, ARE PASSED INTO EFFECTIVE CONTACT WITH AN ABSORBENT LIQUID COMPRISING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE ALKALI METAL OR AMINE SALT OF A POLYBASIC ACID AT A TEMPERATURE BELOW ABOUT 90*C. TO EFFECT REMOVAL OF SULFUR DIOXIDE FROM THE GASES AND, IF DESIRED, THE SULFUR DIOXIDE IS THEREAFTER RECOVERED BY HEATING THE ORGANIC SALT SOLUTION IN WHICH IT IS DISSOLVED TO A TEMPERATURE IN EXCESS OF ABOUT 90*C.
Inventors
- 👤 W Knowles
- 👤 Sabet S Abdou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |