US3580702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing sulfur oxides from gases
Assignee: United States Department of the Interior
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Filing: 1968-09-10
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Granted: 1971-05-25
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Expires: 1988-09-10
Abstract
Abstract SULFUR OXIDES ARE REMOVED FROM GASES BY CONTACTING THE SAME AT ELEVATED TEMPERATURES WITH A DRY ABSORBENT SELECTED FROM THE GROUP CONSISTING OF RED MUD, RETORTED OIL SHALE, RETORTED OIL SHALE TREATED WITH SODIUM HYDROXIDE AND MIXTURES OF RETORTED OIL SHALE AND RED MUD TREATED WITH SODIUM HYDROXIDE. THESE ADSORBENTS MAY BE USED ON A ONCE-THROUGH BASIS OR THEY MAY BE REGENERATED. CATALYTIC OXIDATION OF THE GASES, THOUGH NOT NECESSARY, MAY PRECEDE CONTACT WITH THE ABSORBENTS. D R A W I N G
Inventors
- 👤 John G Myers
- 👤 Joseph H Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |