US3775304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing the ratio of aromatics to saturates in hydrodesulfurization of heavy asphaltic feed oil
Assignee: Gulf Research and Development Co
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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 DESULFURIZED TO REMOVE REFRACTORY, ASPHALTIC SULFUR WITHOUT EXCESSIVELY CONVERTING THE ASPHALTENES AND RESINS PRESENT IN A HYDRODESULFURIZATION PROCESS, WHEREIN THE RATIO OF AROMATICS TO SATURATES IS INCREASED TO PROVIDE THE PROPER SOLVATION FOR THE ASPHALTENES AND RESINS AND THEREBY INCREASE THEIR DESULFURIZATION RATE.
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 |