Patent US3809631A successfully refreshed from Google Patents.
US3809631A
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US
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Method for treating oil-containing wastes
Assignee: Individual
•
Filing: 1973-03-08
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Granted: 1974-05-07
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Expires: 1993-03-08
Abstract
Abstract A METHOD FOR TREATING INDUSTRIAL WASTES CONTAINING OILS AND SURFACTANTS, WHICH COMPRISES ADJUSTING THE PH OF SUCH WASTE TO 3 OR LESS, SUBJECTING THE WASTE TO AN ELECTROLYTIC TREATMENT USING AN ANODE COMPOSED OF AN ACID-TESISTANT ELECTRODE MATERIAL AND A CATHODE COMPOSED OF AN ORDINARY ELECTRODE MATERIAL THEREBY SEPARATING THE OIL PHASE FROM THE AQUEOUS PHASE HAVING THE SURFACTANTS DISSOLVED THEREIN, AND THEN SUBJECTING THE AQUEOUS PHASE SEPARATED FROM THE OIL PHASE TO AN ELECTROLYTIC TREATMENT USING AN ANODE AND A CATHODE COMPOSED OF AALUMINUM THEREBY PRECIPITATEING THE SURFACTANTS AS SLUDGE SEPARATED FROM WATER.
Inventors
- 👤 M Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:09
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/463; B; B01; B01D; B01D17/00; B01D17/06; C02F1/40; C02F1/46104; C02F1/46109; C02F2001/46133
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |