US3775305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodesulfurization process for producing a heavy asphaltic fuel oil
Assignee: Gulf Research and Development Co
•
Filing: 1971-12-08
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Granted: 1973-11-27
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Expires: 1991-12-08
Abstract
Abstract ASPHALT-CONTAINING OILS ARE HYDRODESULFURIZED TO BELOW A REFRACTORY SULFUR LEVEL WITHOUT EXCESSIVELY CONVERTING THE ASPHALT PRESENT BY EMPLOYING A TWO-STAGE HYDRODESULFURIZATION SYSTEM WITH INTERSTAGE HYDROGEN SULFIDE AND LIGHT OIL REMOVAL, WHEREIN THE AVERAGE HYDROGEN PARTIAL PRESSURE IN EACH HYDROESULFURIZATION STAGE IS MAINTAINED SUFFICIENTLY HIGH THAT THE AVERAGE REACTION RATE CONSTANT IS IMPROVED BY A TWO-STAGE OPERATION, BUT SUFFICIENTLY LOW SO THAT NOT LESS THAN ABOUT 50 PERCENT BY WEIGHT OF THE FEED IS RECOVERED AS A PRODUCT BOILING ABOVE THE I.B.P. OF THE FEED.
Inventors
- 👤 J Mckinney
- 👤 J Paraskos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:14
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; C10G2300/00; C10G2300/10; C10G2300/107
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |