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US3663420A
Expired / Lapsed
US
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Coal processing
Assignee: Atlantic Richfield Co
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Filing: 1970-10-14
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Granted: 1972-05-16
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Expires: 1990-10-14
Abstract
Abstract A METHOD FOR FORMING A LOW SULFUR RESIDUAL FUEL OIL FROM A HIGH SULFUR COAL COMPRISING HYDROGENATING THE COAL IN THE ABSENCE OF EXTERNALLY SUPPLIED CONTACT PARTICLES AND AT AN ELEVATED TEMPERATURE, FOLLOWED BY SEPARATING SOLID PARTICLES FROM THE LIQUEFIED COAL AT AN ELEVATED TEMPERATURE.
Inventors
- 👤 Harry E Jacobs
- 👤 George R Worrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:41
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065; C10G1/04; C10G1/045
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |