US3794714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for washing sulfur oxide-containing gases with a slurry of lime
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1971-11-16
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Granted: 1974-02-26
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Expires: 1991-11-16
Abstract
Abstract A process for washing a sulfur oxide-containing gas with a slurry of lime, comprising passing the gas from a first absorbing unit to a second absorbing unit while passing a sulfur oxide absorbing liquid from the second absorbing unit to the first absorbing unit, and occasionally reversing the flow directions of the gas and the absorbing liquid, whereby attachment of a scale to the inner surfaces of said absorbing units is prevented.
Inventors
- 👤 M Atsukawa
- 👤 K Kamei
- 👤 T Furumoto
- 👤 N Tsuneyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
A process according to claim 1 wherein the absorbing liquid used in the first absorbing unit has a pH below 4 wherein the absorbing liquid used in the second absorbing unit has a pH of above 7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |