Patent US3761399A successfully refreshed from Google Patents.
US3761399A
Expired / Lapsed
US
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Two zone hydrodesulfurization of asphaltic fuel oil
Assignee: Gulf Research and Development Co
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Filing: 1971-12-08
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Granted: 1973-09-25
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Expires: 1991-12-08
Abstract
Abstract ASPHALT-CONTAINING OILS ARE HYDRODESULFURIZED TO BELOW A REFRACTORY, ONE PERCENT SULFUR LEVEL WITHOUT EXCESSIVELY CONVERTING THE ASPHALTENES AND RESINS PRESENT BY EMPLOYING A TWO-STAGE HYDRODESULFURIZATION PROCESS WITH INTERSTAGE HYDROGEN SULFIDE AND LIGH OIL REMOVAL, WHEREIN THE SULFUR-CONTAINING ASPHALTENES AND RESINS PRESENT IN THE ASPHALTIC OIL ARE SULUBILIZED AND THEREBY RENDERED MORE EASILY DESULFURIZED BY AN AROMATIC-CONTAINING LIGHT OIL THAT IS BOTH PRODUCED IN SITU IN THE HYDRODESULFURIZATION ZONES AND IS OBTAINED FROM FEED AND PRODUCT STREAMS WITHIN THE SYSTEM.
Inventors
- 👤 Kinney J Mc
- 👤 J Paraskos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:02
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |