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Patent US3733255A successfully refreshed from Google Patents.
US3733255A
Expired / Lapsed
US
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Conversion of municipal refuse,sewage sludge and other wastes to heavy oil or bitumen
Assignee: United States Department of the Interior
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Filing: 1970-10-30
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Granted: 1973-05-15
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Expires: 1990-10-30
Abstract
Abstract MUNICIPAL SEWAGE SLUDGE, REFUSED AND OTHER WASTES ARE CONVERTED TO HEAVY OIL OR BITUMEN BY HEATING UNDER PRESSURE, IN THE ABSENCE OF AIR, IN THE PRESENCE OF CARBON MONOXIDE AND WATER.
Inventors
- 👤 H Appell
- 👤 J Tosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
C; C11; C11B; C11B13/00; C02; C02F; C02F1/00; C02F1/02; C02F1/025; C10; C10G; C10G1/00; C10G1/06; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/74; Y10; Y10S; Y10S423/00; Y10S423/18
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |