US3701727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage aerobic and fucultative waste treatment
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1971-07-19
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Granted: 1972-10-31
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Expires: 1991-07-19
Abstract
Abstract A BIODEGRADABLE WASTE IS TREATED AEROBICALLY BY HIGHRATE AERATION AND MIXING IN A FIRST BASIN FOR A CRITICAL PERIOD FOLLOWED BY LOW-RATE AERATION AND MIXING IN THE UPPER ZONE OF A SECOND BASIN AND FROM WHICH THE EFFLUENT IS WITHDRAWN. THE SOLIDS WHICH SETTLE TO THE LOWER ZONE DECOMPOSE UNDER ANAEROBIC CONDITIONS AND THE LIQUID DECOMPOSITION PRODUCTS ARE TREATED AEROBICALLY AS THEY MORE UPWARDLY FROM THE LOWER INTO THE UPPER ZONE. THE SECOND BASIN OPERATES AS A MODIFIED FACULTATIVE LAGOON.
Inventors
- 👤 Richard A Kormanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/30
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |