Patent US3709975A successfully refreshed from Google Patents.
US3709975A
Expired / Lapsed
US
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Method for the oxidation of black liquor
Assignee: OI Glass Inc
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Filing: 1970-05-28
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Granted: 1973-01-09
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Expires: 1990-05-28
Abstract
Abstract A CONTINUOUS PROCESS FOR THE MOLECULAR OXYGENATION OF BLACK LIQUOR BY THE UNINTERRUPTED STEPS OF OXIDIZING THE BLACK LIQUID IN A FIRST OXYGENATION REACTOR, NEXT, CONTINOUSLY OXIDIZING THE LIQUOR IN A TUBULAR CONDUIT ACTING AS A REACTOR CONNECTING THE FIRST REACTOR TO A SECOND OXYGENATION REACTOR, AND CONTINUOUSLY OXIDIZING THE LIQUOR IN THE SECOND REACTOR, THEN TRANSFERRING THE LIQUOR TO A STORAGE AREA WHEREIN THE LIQUOR IS MAINTAINED UNDER OXIDIZING CONDITIONS WHILE IT IS SIMULTANEOUSLY OXIDIZED IN THE STORAGE TANKS TO PRODUCE AN OXIDIZED BLACK LIQUOR.
Inventors
- 👤 C Amsden
- 👤 S Galeano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:46
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0057; 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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |