Patent US2213159A successfully refreshed from Google Patents.
Patent US3272740A successfully refreshed from Google Patents.
US3272740A
Expired / Lapsed
US
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Sewage sludge treatment process
Assignee: STWB Inc
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Filing: 1964-06-24
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Granted: 1966-09-13
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Wayne B Gitchel
- 👤 Clarence A Hoffman
- 👤 Eugene W Schoeffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:45
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/06; C02F11/08; C02F11/12; C02F11/13; C02F3/00; C02F3/28; C05; C05F; C05F7/00; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/20; Y02W; Y02W10/00; Y02W10/40; Y02W30/00; Y02W30/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A CONTINUOUS PROCESS FOR PRODUCING FROM SEWAGE SLUDGE INNOCUOUS, SUBSTANTIALLY ODOR-FREE, CURED ORGANIC SLUDGE HAVING OPTIMUM PROCESSING CHARACTERISTICS WHICH COMPRISING THE STEPS OF (A) CONTINUOUSLY MIXING A SUBSTANTIALLY CONSTANT VOLUME OF SEWAGE SLUDGE WITH A SUBSTANTIALLY CONSTANT VOLUME OF AIR IN A SELECTED PROPORTION WHICH SUPPLIES TO THE MIXTURE AN AMOUNT GASEOUS OXYGEN CAPABLE OF REDUCING BY MORE THAN 5 PERCENT THE C.O.D OF THE SLUDGE OF OXIDATION TO PRODUCE A MIXTURE HAVING A GASEOUS AND A LIQUID PHASE; (B) CONTINUOUSLY HEATING A STREAM OF THE RESULTANT MIXTURE TO A TEMPERATURE ABOVE ABOUT 170:C. UNDER CONDITIONS CAPABLE OF CONSUMING ALL THE OXYGEN IN THE MIXTURE; (C) HEATING THE MIXTURE FOR A PERIOD OF TIME WHICH REDUCES THE C.O.D OF THE SLUDGE BY BETWEEN 5 PERCENT AND 45 PERCENT AND WHICH MAINTAINS BETWEEN ABOUT 0.5 PERCENT AND 6.5 PERCENT GASEOUS OXYGEN CONTENT IN THE GASEOUS PHASE OF THE OXIDIZED MIXTURE, THEREBY
Claim 2
Dependent Claim
150 words
A CONTINUOUS PROCESS FOR PRODUCING FROM SEWAGE SLUDGE INNOCUOUS, SUBSTANTIALLY ODOR-FREE, CURED ORGANIC SLUDGE HAVING OPTIMUM PROCESSING CHARACTERISTICS WHICH COMPRISING THE STEPS OF (A) CONTINUOUSLY MIXING A SUBSTANTIALLY CONSTANT VOLUME OF SEWAGE SLUDGE WITH A SUBSTANTIALLY CONSTANT VOLUME OF AIR IN A SELECTED PROPORTION WHICH SUPPLIES TO THE MIXTURE AN AMOUNT GASEOUS OXYGEN CAPABLE OF REDUCING BY MORE THAN 5 PERCENT THE C.O.D OF THE SLUDGE OF OXIDATION TO PRODUCE A MIXTURE HAVING A GASEOUS AND A LIQUID PHASE; (B) CONTINUOUSLY HEATING A STREAM OF THE RESULTANT MIXTURE TO A TEMPERATURE ABOVE ABOUT 170:C. UNDER CONDITIONS CAPABLE OF CONSUMING ALL THE OXYGEN IN THE MIXTURE; (C) HEATING THE MIXTURE FOR A PERIOD OF TIME WHICH REDUCES THE C.O.D OF THE SLUDGE BY BETWEEN 5 PERCENT AND 45 PERCENT AND WHICH MAINTAINS BETWEEN ABOUT 0.5 PERCENT AND 6.5 PERCENT GASEOUS OXYGEN CONTENT IN THE GASEOUS PHASE OF THE OXIDIZED MIXTURE, THEREBY
References Cited (Backward Citations)
US3060118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |