US3597347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for retorting carbonaceous material
Assignee: Oil Shale Corp
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Filing: 1968-12-06
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Granted: 1971-08-03
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Expires: 1988-12-06
Abstract
Abstract AN IMPROVED PROCESS FOR RETORTING CARBONACEOUS MATERIAL, SUCH AS OIK SHALE, WHERE THE HET OF PYROLYSIS IS SUPPLIED BY MIXING HOT SPENT SHALE ASH WITH RAW SHALE FEED SHALE PARTICLWS LOSE THEIR STRENGTH PROGRESSIVELY ABOVE ABOUT 500*F. SO CRUSHING OF THE FEED TO MINUM 1/8 INCH SIZE DOES NOT TAKE PLACE UNTIL AFTER MIXING OR RETORTING. COLD SHALE FEED FINES ARE ADDED TO THE MIXED HOT SHALE ASH AND LARGER SHALE FEED BEFORE RETORTING.
Inventors
- 👤 Rex T Ellington Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/06; C10G; C10G1/00; C10G1/02
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |