US3594304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal liquefaction of coal
Assignee: Sunoco Inc
•
Filing: 1970-04-13
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Granted: 1971-07-20
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Expires: 1990-04-13
Abstract
Abstract A SUB-BITUMINOUS COAL IS LIQUEFIED BY RAPIDLY HEATING SLURRY OF SAID POWDERED COAL IN A HYDROGENATED SOLVENT AT A TEMPERATURE RANGE OF FROM 440* TO 450*C., AND A RESIDENCE TIME OF FROM ABOUT 5 TO 20 MINUTES.
Inventors
- 👤 Walter H Seitzer
- 👤 Robert W Shinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:21
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/042; C10G1/06; C10G1/065
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |