Patent US3700583A successfully refreshed from Google Patents.
US3700583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal liquefaction using carbon radical scavengers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-03-19
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Granted: 1972-10-24
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Expires: 1991-03-19
Abstract
Abstract COAL LIQUIFACTION YIELDS ARE INCREASED BY LIQUEFYING THE COAL IN A LIQUEFACTION ZONE AS A SLURRY IN A HYDROGENDONOR SOLVENT IN THE PRESENCE OF A CARBON RADICAL SCAVENGER SELECTED FROM QUINONES AND THE HALOGENS INDINE, BROMINE AND CHLORINE, AND THE HYDROGEN HALIDES THEREOF. PREFERABLY A COAL LIQUIDS STREAM WHICH BOILS WITHIN THE RANGE FROM ABOUT 500*F. TO ABOUT 1000*F. IS OXIDIZED TO GENERATE QUINONES, AND THE OXIDIZED STREAM IS RECYCLED TO THE LIQUEFACTION ZONE.
Inventors
- 👤 James E Salamony
- 👤 William H Starnes Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:53
CPC Classifications
C; C10; C10G; C10G1/00; 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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |