US3558426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of waste liquors from pulp and paper mills
Assignee: Texaco Inc
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Filing: 1968-11-29
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Granted: 1971-01-26
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Expires: 1988-11-29
Abstract
Abstract PROCESS FOR HEAT TREATMENT OF WAST LIQUORS FROM PULT AND PAPER MILLS WHEREIN WASTE LIQUOR IS HEATED BY DIRECT CONTACT WITH HOT HYDROCARBON LIQUID TO A TEMPERATURE IN THE RANGE OF 400 TO 700*F. UNDER SUFFICIENT PRESSURE TO PREVENT VAPORIZATION OF WATER THEREBY CONVERTING WATER SOLUBLE ORGANIC MATERIAL TO A WATER INSOLUBLE SOLID PRODUCT, OR COKE, WHICH IS SEPARATED FROM TREATED AQUEOUS LIQUID EFFLUENT OF LOW CHEMICAL OXYGEN DEMAND (COD) SUITABLE FOR REUSE IN THE PRODUCTION OF COOKING LIQUOR FOR THE PULPING PROCESS OR DISPOSAL IN LAKES OR STREAMS WITHOUT SIGNIFICANT WATER POLLUTION.
Inventors
- 👤 Howard V Hess
- 👤 Edward L Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:01
CPC Classifications
C; C02; C02F; C02F11/00; Y; Y10; Y10S; Y10S210/00; Y10S210/928
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |