US3596767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment apparatus
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1969-02-11
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Granted: 1971-08-03
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Expires: 1989-02-11
Abstract
Abstract A sewage treatment apparatus and method comprising a biological treatment tank, preferably including rotatable biological contactor means therein. Means are provided for sensing the hydraulic flow rate in the system and also for sensing the organic concentration of the sewage or of the effluent, and for recycling secondary sludge to the biological treatment tank as a function of the hydraulic flow rate and of the organic concentration.
Inventors
- 👤 Ronald L Antonie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/006; C02F3/12; C02F3/1205; C02F3/1221; C02F3/08; C02F3/082; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |