US3556722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating sulfurous acid gas-containing exhaust gas
Assignee: Furukawa Mining Co Ltd
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Filing: 1967-09-21
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Granted: 1971-01-19
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Expires: 1987-09-21
Abstract
Abstract A PROCESS WHICH COMPRISES TREATING EXHAUST GAS CONTAINING SULFUROUS AND/OR SULFURIC ACID GAS WITH A SOLUTION OR SUSPENSION OF THE HYDROXIDE OR CARBONATE OF CALCIUM, TO PRODUCE THE CORRESPONDING SULFITE AND/OR SULFATE, ADDING WASTE SULFURIC ACID TO THE LIQUID SO OBTAINED TO CONVERT THE SULFITE TO THE CORRESPONDING SULFATE SIMULTANEOUSLY WITH THE EVOLUTION OF SULFUROUS ACID GAS AND DEGASSING THE LIQUID THUS OBTAINED BY BLOWING THE AIR THEREINTO, TO RECOVER THE SULFATE AND SULFUROUS ACID GAS FROM THE EXHAUST GAS AND CONSEQUENTIALLY ELIMINATE A PUBLIC NUISANCE OTHERWISE CAUSED THEREBY.
Inventors
- 👤 Tooru Owaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:04
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; B01D53/501; C01F; C01F11/00; C01F11/46; C01F11/464
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |