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Patent US3751358A successfully refreshed from Google Patents.
US3751358A
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US
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Freeze-thaw separation of solids from tar sands extraction effluents
Assignee: Great Canadian Oil Sands Ltd
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Filing: 1972-01-19
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Granted: 1973-08-07
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Expires: 1992-01-19
Abstract
Abstract THIS SPECIFICATION DISCLOSES TREATMENT OF WATER DISCHARGED FROM A HOT WATER PROCESS FOR SEPARATING BITUMEN FROM TAR SANDS. THE TREATMENT COMPRISES AGGLOMERATING CLAY DISPERSED IN THE WATER, ALTERNATELY FREEzING AND THAWING THE WATER INTO A SLUDGE LAYER AND A CLARIFIED WATER LAYER. THE CLARIFIED WATER LAYER IS SUBSTANTIALLY REDUCED IN CLAY CONTENT COMPARED TO THE WATER DISCHARGED FROM THE HOT WATER PROCESS AND IS SUITABLE FOR RECYCLE OR DISCARD.
Inventors
- 👤 O Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:43
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/007; C02; C02F; C02F11/00; C02F11/18; C02F11/20; C10G; C10G1/00; C10G1/04; C10G1/047
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |