Patent US3775311A successfully refreshed from Google Patents.
US3775311A
Expired / Lapsed
US
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Screening aerator concentrator
Assignee: Sweco Inc
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Filing: 1971-05-06
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Granted: 1973-11-27
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Expires: 1991-05-06
Abstract
Abstract AN APPARATUS FOR SEPARATING WASTE WATER INTO A WASTE CONTAINING CONCENTRATE AND A RELATIVELY WASTE FREE EFFLUENT IS DISCLOSED. THE APPARATUS COMPRISES A FINE MESH ROTATING SCREEN AERATOR COMBINED WITH A FROTH FLOTATION SYSTEM. NEW METHODS FOR CONCENTRATING WASTE WATER ARE ALSO DISCLOSED UTILIZING SEPARATION BY A COMBINATION OF A ROTATING AERATING SCREEN WITH FROTH FOTATION PROCEDURES, AS WELL AS CONCENTRATING WASTE WATER AND ENHANCING THE ENTRY OF AIR TO THE APPARATUS TO INCREASE THE DISSOLVED AND ENTRAINED OXYGEN IN THE EFFLUENT.
Inventors
- 👤 P Mook
- 👤 T Westfall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:59
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; B; B01; B01D; B01D33/00; B01D33/06; B01D33/11; B03; B03D; B03D1/00; B03D1/02; B03D1/028; B03D1/14; B03D1/1412; B03D1/1431; B03D1/1443; B03D1/1475; B03D1/16; B01D2201/00; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 0
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |