US3203893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal from sewage of surfactants resistant to biodegradation
Assignee: California Research LLC
•
Filing: 1962-10-19
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Granted: 1965-08-31
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Expires: 1982-10-19
Abstract
No abstract record available.
Inventors
- 👤 House Ralph
- 👤 Samuel H Sharman
- 👤 Kyriacou Demetrios
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:50
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; C02F3/00; C02F3/02; C02F3/12; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD OF REMOVING SURFACTANTS WHICH ARE RESISTAND TO BIODEGRADATION FROM SEWAGE WHICH COMPRISES TREATING THE SEWAGE IN AN AERATION TANK WITH ACTIVATED SLUDGE, TRANSFERRING THE TREATED SEWAGE TO A SEDIMENTATION TANK AND ALLOWING THE SOLIDS TO SETTLE, TRANSFERRING THE SUPERNATANT LIQUID AS EFFLUENT FROM THE SEDIMENTATION TANK TO A FOAM-FRACTIONATING VESSEL, RAPIDLY PASSING GAS THROUGH SAID SEDIMENTATION TANK EFFLUENT IN SAID VESSEL FOR A PERIOD OF TIME IN THE RANGE OF ABOUT 10 MINUTES TO 24 HOURS PRODUCING FOAM IN AN UPPER PORTION OF SAID VESSEL, RETURNING THE FOAM FROM THE UPPER PORTION OF THE VESSEL TO SAID AERATION TANK AND COLLECTING WATER HAVING NOT MORE THAN ABOUT 1 P.P.M. OF RESISTANT SURFACTANT FROM A LOWER PORTION OF SAID FOAM-FRACTIONATING VESSEL.
Claim 2
Independent Claim
122 words
A METHOD OF REMOVING SURFACTANTS WHICH ARE RESISTAND TO BIODEGRADATION FROM SEWAGE WHICH COMPRISES TREATING THE SEWAGE IN AN AERATION TANK WITH ACTIVATED SLUDGE, TRANSFERRING THE TREATED SEWAGE TO A SEDIMENTATION TANK AND ALLOWING THE SOLIDS TO SETTLE, TRANSFERRING THE SUPERNATANT LIQUID AS EFFLUENT FROM THE SEDIMENTATION TANK TO A FOAM-FRACTIONATING VESSEL, RAPIDLY PASSING GAS THROUGH SAID SEDIMENTATION TANK EFFLUENT IN SAID VESSEL FOR A PERIOD OF TIME IN THE RANGE OF ABOUT 10 MINUTES TO 24 HOURS PRODUCING FOAM IN AN UPPER PORTION OF SAID VESSEL, RETURNING THE FOAM FROM THE UPPER PORTION OF THE VESSEL TO SAID AERATION TANK AND COLLECTING WATER HAVING NOT MORE THAN ABOUT 1 P.P.M. OF RESISTANT SURFACTANT FROM A LOWER PORTION OF SAID FOAM-FRACTIONATING VESSEL.
References Cited (Backward Citations)
US2987186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |