Patent US3337448A successfully refreshed from Google Patents.
US3337448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment process
Assignee: FMC Corp
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Filing: 1965-04-29
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Granted: 1967-08-22
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Expires: 1985-04-29
Abstract
No abstract record available.
Inventors
- 👤 Linvil G Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:26
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
THE METHOD OF TREATING SEWAGE WHICH COMPRISS ESTABLISHING A MAIN BODY OF LIQUID CONTAINING A CULTURE OF MICROOGANISMS NORMALLY PRESENT IN SEWAGE WASTES, INTRODUCING SEWAGE HAVING UNSATISIFED BIOCHEMICAL OXYGEN DEMAND INTO SAID BODY OF LIQUID TO FORM AN AQUEOUS MIXTURE, MAINTAINING THE MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN ABOUT 45*C. AND 65*C., AERATING SAID MIXTURE WITH QUANTITIES OF AIR MAINTAINING A DISSOLVED OXYGEN CONTENT CONDUCTIVE THE GROWTH OF MICROOGANISMS AND ELIMINATION OF BIOCHEMICAL OXYGEN DEMAND, WITHDRAWING FROM SAID MAIN BODY OF LIQUID QUANTITY OF AERATED MIXTURE CONTAINING MINOR AMOUNTS OF VIABLE ORGANISMS, SAID QUANTITY BEING EQUAL TO THE VOLUME OF INFLUENT SEWAGE PLUS A PREDETERMINED VOLUME OF AQUEOUS MEDIUM TO BE RECYCLED, SEPARATING A PORTION OF SAID WITHDRAWN MIXTURE FOR DISCHARGE TO WASTE, SUBJECTING THE REMAINDER OF SAID WITHDRAWN AERATED MIXTURE TO HEAT TREATMENT AT A TEMPERATURE DESTRUCTIVE OF THE ACTIVITY OF VIABLE MICROOGANISMS, AND RECIRCULATING HEAT TREATED MATERIAL.
Claim 2
Independent Claim
151 words
THE METHOD OF TREATING SEWAGE WHICH COMPRISS ESTABLISHING A MAIN BODY OF LIQUID CONTAINING A CULTURE OF MICROOGANISMS NORMALLY PRESENT IN SEWAGE WASTES, INTRODUCING SEWAGE HAVING UNSATISIFED BIOCHEMICAL OXYGEN DEMAND INTO SAID BODY OF LIQUID TO FORM AN AQUEOUS MIXTURE, MAINTAINING THE MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN ABOUT 45*C. AND 65*C., AERATING SAID MIXTURE WITH QUANTITIES OF AIR MAINTAINING A DISSOLVED OXYGEN CONTENT CONDUCTIVE THE GROWTH OF MICROOGANISMS AND ELIMINATION OF BIOCHEMICAL OXYGEN DEMAND, WITHDRAWING FROM SAID MAIN BODY OF LIQUID QUANTITY OF AERATED MIXTURE CONTAINING MINOR AMOUNTS OF VIABLE ORGANISMS, SAID QUANTITY BEING EQUAL TO THE VOLUME OF INFLUENT SEWAGE PLUS A PREDETERMINED VOLUME OF AQUEOUS MEDIUM TO BE RECYCLED, SEPARATING A PORTION OF SAID WITHDRAWN MIXTURE FOR DISCHARGE TO WASTE, SUBJECTING THE REMAINDER OF SAID WITHDRAWN AERATED MIXTURE TO HEAT TREATMENT AT A TEMPERATURE DESTRUCTIVE OF THE ACTIVITY OF VIABLE MICROOGANISMS, AND RECIRCULATING HEAT TREATED MATERIAL.
References Cited (Backward Citations)
US3219575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |