Patent US5756240A successfully refreshed from Google Patents.
US2609331A
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Pyrolytic conversion of oil shale
Assignee: Sinclair Refining Co
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Filing: 1947-06-17
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Granted: 1952-09-02
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Expires: 1967-06-17
Abstract
No abstract record available.
Inventors
- 👤 Leroy K Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:48
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN THE PROCESS OF PRODUCTING SHALE OIL FROM OIL SHALE, INCLUDING THE RETORTING OF THE OIL SHALE, THE IMPROVEMENT WHICH COMPRISES GRINDING THE OIL SHALE TO BE PROCESSED WITH WATER TO FORM A SLURRY, TREATING THE SLURRY WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID, HYDROFLUORIC ACID, AND HYDROGEN FLUORIDE IN AN AMOUNT EQUAL TO 0.5 TO 6% BY WEIGHT OF THE OIL SHALE IN THE SLURRY WHILE THOROUGHLY MIXING SAID MATERIAL INORGANIC CONSTITUENTS OF THE OIL SHALE, ACTIVATING INORGANIC CONSTITUENTS OF THE OIL SHALE, FILTERING THE SLURRY TO REMOVE EXCESS WATER, DRYING THE FILTERED OIL SHALE, AND SUBJECTING IT TO A RETORTING OPERATION AND PRODUCING SHALE OIL THEREFROM.
Claim 2
Dependent Claim
112 words
IN THE PROCESS OF PRODUCTING SHALE OIL FROM OIL SHALE, INCLUDING THE RETORTING OF THE OIL SHALE, THE IMPROVEMENT WHICH COMPRISES GRINDING THE OIL SHALE TO BE PROCESSED WITH WATER TO FORM A SLURRY, TREATING THE SLURRY WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID, HYDROFLUORIC ACID, AND HYDROGEN FLUORIDE IN AN AMOUNT EQUAL TO 0.5 TO 6% BY WEIGHT OF THE OIL SHALE IN THE SLURRY WHILE THOROUGHLY MIXING SAID MATERIAL INORGANIC CONSTITUENTS OF THE OIL SHALE, ACTIVATING INORGANIC CONSTITUENTS OF THE OIL SHALE, FILTERING THE SLURRY TO REMOVE EXCESS WATER, DRYING THE FILTERED OIL SHALE, AND SUBJECTING IT TO A RETORTING OPERATION AND PRODUCING SHALE OIL THEREFROM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |