US3752875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing reaction rate in conversion of sulfides and hydrosulfides
Assignee: OI Glass Inc
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Filing: 1970-12-28
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Granted: 1973-08-14
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Expires: 1990-12-28
Abstract
Abstract A CATALYTIC PROCESS FOR ENHANCING THE RATE OF OXIDATION OF ALKALINE SOLUTIONS OF WATER-SOLUBLE, OXIDIZABLE, INORGANIC SULFIDES AND/OR HYDROSULFIDES WHEREIN EFFECTIVE CATALYTIC AMOUNTS OF WATER-INSOLUBLE SMELT SOLIDS ARE EMPLOYED. THESE SOLIDS SELECTIVELY CATALYZE THE REACTION BY WHICH THIOSULFATE IS FORMED. THIS CATALYTIC PROCESS MAY ALSO BE EMPLOYED FOR SUBSTANTIALLY INCREASING THE RATE OF OXIDATION OF SULFIDES IN A PULPING GREEN LIQUOR TO THEREBY GREATLY DEPLETE THE AMOUNT OF SODIUM SULFIDE PRESENT THEREIN AND SIMULTANEOUSLY FORM SUBSTANTIAL QUANTITIES OF SODIUM HYDROXIDE WHICH MAY BE EMPLOYED TO ABSORB EFFLUENT SULFUR DIOXIDE EMANATING, FOR EXAMPLE, FROM BOILERS.
Inventors
- 👤 Hern H O
- 👤 K Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0057; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; C; C01; C01B; C01B17/00; C01B17/64; C01D; C01D1/00; C01D1/04; Y; Y10; Y10S; Y10S423/00; Y10S423/03
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |