US3589863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing sulfur dioxide and particulate matter from gaseous streams
Assignee: Dow Chemical Co
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Filing: 1968-03-08
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Granted: 1971-06-29
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Expires: 1988-03-08
Abstract
Abstract ACID GASES AND PARTICULATE MATTER ARE REMOVED FROM GASEOUS STREAMS BY A PROCESS WHICH COMPRISES PASSING THE GASEOUS STREAM THROUGH A BED OF POROUS ALKALI METAL BICARBONATE AGGREGATES. THE BED CAN BE FIXED SYSTEM OR A COUNTERCURRENTLY MOVING REPLENSISHED SYSTEM. THE POROUS AGGREGATES ATTRACT THE PARTICUALTRES MATTER TO THEIR SURFACE AND THUS REMOVE THEM FROM THE STREAM WHILE THE ACID GAS IS SIMULTANEOUSLY REACTED WITHIN OR AROUND THE AGGREGATES TO FORM SOLIDS WHICH LEAVE THE GASEOUS STREAM.
Inventors
- 👤 Ludo K Frevel
- 👤 Leonard J Kressley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:38
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |