US3822204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for separation of sludge
Assignee: FMC Corp
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Filing: 1970-06-12
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Granted: 1974-07-02
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Expires: 1990-06-12
Abstract
Abstract AN APPARATUS FOR SEPARATING A SLUDGE-CONTAINING LIQUID MEDIUM PRODUCED BY THE PROCESSING OF SEWAGE INTO A CLARIFIED LIQUID AND A SLUDGE CONCENTRATE. COMPANION ELECTRODES IN THE BOTTOM OF THE CONTAINER PRODUCE GAS BY ELECTROLYSIS OF WATER WHICH RISES AS DISPERSED BUBBLES AND UPON OCCLUSION TO SLUDGE PARTICLES FLOATS THE PARTICLES TO THE LIQUID SURFACE. SLUDGE CONCENTRATE FLOATING ADJACENT THE SURFACE OF THE LUQUID MEDIUM IS MOVED OUT OF THE CONTAINER BY A SKIMMER AND CLARIFIED LIQUID IS DISCHARGED FROM THE LOWER PORTION OF THE CONTAINER.
Inventors
- 👤 F Sako
- 👤 S Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:12
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/465; B; B03; B03D; B03D1/00; B03D1/14; B03D1/1437; B03D1/1443; B03D1/1462; B03D1/1493; C02F2101/00; C02F2101/10; C02F2101/105
Claims Analysis
Total Claims: 0
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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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |