US3740363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effluent treatment processes
Assignee: Gulf States Paper Corp
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Filing: 1969-10-27
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Granted: 1973-06-19
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Expires: 1989-10-27
Abstract
Abstract A WASTE EFFLUENT TREATMENT WHICH INVOLVES CONTRACTING A WASTE EFFLUENT, E.G., PULP AND PAPER MILL EFFLUENT, WITH A METAL SALT REAGENT, PREFERABLY ALUM MUD. TREATMENT DECOLORIZED THE EFFLUENT AND PRECIPITATES A SUBSTANTIAL PORTION OF THE ORGANIC CONTENT. THE PRECIPITATE AND SLUDGE IS DEWATERED, THEN CALCINED, AND THE REAGENT REGENERATED FROM THE ASH FOR USE AGAIN IN A CYCLIC PROCESS. THE DECOLORIZED EFFUENT IS BIO-OXIDIZED, PREFERABLY IN A MULTISTAGE BIO-OXIDATION SEQUENCE AND IS NOW SUFFICIENTLY PURE FOR RECYCLE PURPOSES. THE PURIFIED EFFLUENT MAY BE BLEACHED PRIOR TO RECYCLE.
Inventors
- 👤 R Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:22
CPC Classifications
C; C02; C02F; C02F9/00; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1215; C02F1/00; C02F1/52; C02F1/5236; C02F2103/00; C02F2103/26; C02F2103/28; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/917
Claims Analysis
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |