US3775303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low sulfur 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 PROCESS WITH INTERSTAGE HYDROGEN SULFIDE AND LIGHT OIL REMOVAL, WHEREIN THE QUANTITY OF AROMATICS AND SATURATES PRESENT IS CONTROLLED TO PROVIDE THE PROPER SOLVATION OF ASPHALTENES AND RESINS SO AS TO PERMIT REFRACTOR SULFUR REMOVAL THEREFROM.
Inventors
- 👤 J Mckinney
- 👤 J Paraskos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:28
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 |