Patent US3714911A successfully refreshed from Google Patents.
US3714911A
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Method of treatment of alkaline pulping black liquors by wet air oxidation
Assignee: Zimpro Passavant Inc
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Filing: 1971-03-10
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Granted: 1973-02-06
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Expires: 1991-03-10
Abstract
Abstract WET OXIDATION AND EVAPORATION OF ALKALINE PULPING BLACK LIQUOR BY APPROXIMATELY A FIFTY PERCENT OXIDATION, E.G., EVAPORATING TWO POUNDS OF WATER PER POUND OF AIR, WITHOUT THE USE OF CONVENTIONAL EVAPORATORS, AND PASSING THE PARTIALLY OXIDIZED CONCENTRATED BLACK LIQUOR DIRECTLY TO THE FURNACE, OR INTERPOSING A FLASH STEAM TANK BETWEEN THE REACTOR AND THE FURNACE.
Inventors
- 👤 L Pradt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:59
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0057
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |