US3671185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of waste gases
Assignee: MW Kellogg Co
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Filing: 1968-08-12
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Granted: 1972-06-20
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Expires: 1988-08-12
Abstract
Abstract COMPOUNDS OF SULFUR AND OF NITROGEN AND FLY ASH ARE REMOVED FROM GASES BY ABSORPTION AT BETWEEN 1500*F. AND 2000*F. UNDER ATMOSPHERIC TO 5 ATMOSPHERES PRESSURE IN A MOLTEN CARBONATE SALT OF SODIUM, POTASSIUM AND/OR LITHIUM, AND THE DECONTAIMINATED COMBUSTION GAS STREAM IS COOLED AND VENTED TO THE ATMOSPHERE.
Inventors
- 👤 Philip A Lefrancois
- 👤 Kenneth M Barclay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/60; B01D53/14; B01D53/1493
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |