US3236766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment process
Assignee: Labcorp Early Development Laboratories Inc
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Filing: 1964-03-31
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Granted: 1966-02-22
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Expires: 1984-03-31
Abstract
No abstract record available.
Inventors
- 👤 Gilbert V Levin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:27
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1215; C02F3/30; C02F3/308; C05; C05F; C05F7/00; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/20; Y02W; Y02W10/00; Y02W10/10; Y02W30/00; Y02W30/40; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A PROCESS FOR TREATING A SEWAGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF RAW SEWAGE AND TREATED SEWAGE TO OBTAIN A SLUDGE AND A SUBSTANTIALLY PHOSPHATEFREE EFFLUENT WHICH COMPRISES: (A) MIXING AN INFLUENT OF SAID SEWAGE MATERIAL WITH A SLUDGE TO FORM A MIXED LIQUOR, (B) INTRODUCING AN OXYGEN-CONTAINING GAS INTO SAID MIXED LIQUOR UNTIL THE DISSOLVED OXYGEN CONTENT OF SAID LIQUOR IS AT LEAST ABOUT 0.3 MG. PER LITER OF SAID MIXED LIQUOR, (C) SEPARATING SLUDGE FROM SAID MIXED LIQUOR WHILE THE DISSOLVED OXYGEN CONTENT THEREOF IS AT LEAST ABOUT 3.0 MG. PER LITER OF SAID MIXED LIQUOR TO PROVIDE A SUBSTANTIALLY PHOSPHATE-FREE EFFLUENT, (D) MAINTAINING SAID SEPARATED SLUDGE UNDER ANAEROBIC CONDITIONS TO REDUCE THE PHOSPHATE CONTENT OF SAID SEPARATED SLUDGE AND TO PROVIDE A PHOSPHATE-ENRICHED SUPERNATANT LIQUOR, (E) SEPARATING SAID PHOSPHATE-ENRICHED SUPERNATANT LIQUOR AND RECOVERING SAID LAST NAMED SLUDGE HAVING A REDUCED PHOSPHATE CONTENT AND (F) RECYCLING SAID RECOVERED LAST NAMED SLUDGE TO PROVIDE SLUDGE FOR MIXING WITH SAID INFLUENT SEWAGE MATERIAL.
Claim 2
Dependent Claim
164 words
A PROCESS FOR TREATING A SEWAGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF RAW SEWAGE AND TREATED SEWAGE TO OBTAIN A SLUDGE AND A SUBSTANTIALLY PHOSPHATEFREE EFFLUENT WHICH COMPRISES: (A) MIXING AN INFLUENT OF SAID SEWAGE MATERIAL WITH A SLUDGE TO FORM A MIXED LIQUOR, (B) INTRODUCING AN OXYGEN-CONTAINING GAS INTO SAID MIXED LIQUOR UNTIL THE DISSOLVED OXYGEN CONTENT OF SAID LIQUOR IS AT LEAST ABOUT 0.3 MG. PER LITER OF SAID MIXED LIQUOR, (C) SEPARATING SLUDGE FROM SAID MIXED LIQUOR WHILE THE DISSOLVED OXYGEN CONTENT THEREOF IS AT LEAST ABOUT 3.0 MG. PER LITER OF SAID MIXED LIQUOR TO PROVIDE A SUBSTANTIALLY PHOSPHATE-FREE EFFLUENT, (D) MAINTAINING SAID SEPARATED SLUDGE UNDER ANAEROBIC CONDITIONS TO REDUCE THE PHOSPHATE CONTENT OF SAID SEPARATED SLUDGE AND TO PROVIDE A PHOSPHATE-ENRICHED SUPERNATANT LIQUOR, (E) SEPARATING SAID PHOSPHATE-ENRICHED SUPERNATANT LIQUOR AND RECOVERING SAID LAST NAMED SLUDGE HAVING A REDUCED PHOSPHATE CONTENT AND (F) RECYCLING SAID RECOVERED LAST NAMED SLUDGE TO PROVIDE SLUDGE FOR MIXING WITH SAID INFLUENT SEWAGE MATERIAL.
References Cited (Backward Citations)
US2337384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |