Patent US3654070A successfully refreshed from Google Patents.
US3654070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation and reuse of effluent from oxygen pulping of raw cellulose
Assignee: Zimpro Passavant Inc
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Filing: 1970-04-02
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Granted: 1972-04-04
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Expires: 1990-04-02
Abstract
Abstract THE SPENT LIQUOR FROM THE PULPING OF CELLULOSIC MATERIAL BY OXIDATION IN AQUEOUS ALKALINE MEDIUM IS SUBJECTED TO OXIDATION WITH AN OXYGEN-CONTAINING GAS AT A TEMPERATURE BETWEEN 200* AND 375*C., WHICH PROCESS OXIDIZES THE ORGANIC WASTE PRODUCTS TO CARBON DIOXIDE AND REGENERATES THE AQUEOUS ALKALINE MEDIUM FOR REUSE IN THE PULPING PROCESS. THE CARBON DIOXIDE PRODUCED IS COLLECTED BY LIQUEFACTION OR DIRECTED TO ENGERY RECOVERY SYSTEMS.
Inventors
- 👤 Louis A Pradt
- 👤 Wayne B Gitchel
- 👤 Clarence A Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:21
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/12; D21C11/14; Y; Y02; Y02P; Y02P70/00; Y02P70/10
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |