US3589997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying waste water
Assignee: Standard Oil Co
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Filing: 1969-05-15
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Granted: 1971-06-29
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Expires: 1989-05-15
Abstract
Abstract IN THIS SYSTEM WASTE WATER, PARTICULARLY REFINERY WASTE WATER, IS TREATED IN A SERIES OF LAGOONS IN WHICH THRIVE MICROORGANISMS THAT FEED ON CONTAMINANTS IN THE WASTE WATER. THE SYSTEM IS CHARACTERIZED BY MOBILE AERATOR APPARATUS MOVING ACROSS THE LAGOONS'' SURFACE. THESE APPARATUS INTRODUCE AIR INTO THE LAGOONS AND CHURN SURFACE WATER, AND THEY HAVE MEANS WHICH DIRECT AT LEAST SOME OF THE CHURNING SURFACE WATER TOWARDS THE LAGOONS'' BOTTOMS. THE UNDERWATER TURBULENCE SCOURS THE LAGOONS'' BOTTOMS AND PROVIDES A WAY OF CONTROLLING SLUDGE DEPOSITS.
Inventors
- 👤 James F Grutsch
- 👤 Russell C Mallatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:23
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/121; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; C02F3/14; C02F3/18; B01F27/00; B01F27/60; B01F33/00; B01F33/50; B01F33/503; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |