US3758405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color removal from kraft mill aqueous effluents
Assignee: US Plywood Champion Papers Inc
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Filing: 1971-11-03
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Granted: 1973-09-11
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Expires: 1991-11-03
Abstract
Abstract THIS INVENTION RELATES TO AN APPARATUS SYSTEM AND A CONTINUOUS METHOD OF REMOVING AND DISPOSING OF COLOR BODIES IN AQUEOUS EFFLUENTS FROM KRAFT PULP MANUFACTURING OPERATION CONTAINING SUCH BODIES COMPRISING ADJUSTING THE PH OF SAID EFFLUENTS TO FROM ABOUT NEUTRALITY TO ABOUT 9, SUBJECTING THE EFFLUENT TO ULTRAFILTRATION TO FORM AN AQUEOUS PERMEATE AND A RETENATE CONTAINING SUBSTANTIALLY ALL THE COLOR BODIES IN SAID EFFLUENT IN A SOLIDS CONCENTRATION OF AT LEAST ABOUT 15%, AND THERMALLY OXIDIZING THE RETENATE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO OXIDIZE THE COLOR BODIES TO COLORLESS INORGANIC SALTS AND COLORLESS INORGANIC GASES WHICH CAN BE SAFELY DISPOSED OF.
Inventors
- 👤 H Fremont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:32
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; C; C02; C02F; C02F1/00; C02F1/44; C02F1/444; C02F1/72; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |