Preparation of high v.i. lube oils
Abstract
Abstract EXTRACTION WITH A SOLVENT HAVING PREFERENTIAL SOLUBILITY FOR AROMATICS, AND INCLUDING THE IMPROVEMENT HEREIN COMPRISING SEPARATIONG THE SOLVENT AND EXTRACT FROM THE LUBRICATING OIL RAFFINATE PRODUCT OF SAID SECOND EXTRACTION AND EMPLOYING SAID SOLVENT WITH PRODUCT EXTRACT THEREIN FOR THE EXTRACTION OF HYDROCRACKER CHARGE STOCK IN SAID FIRST EXTRACTION. A PROCESS FOR PRODUCING HIGH QUALITY AND HIGHLY STABLE LUBRICATING OILS WITH A HIGH VISOCITY INDEX WHEREIN A LUBRICATING OIL FRACTION IS FIRST SOLVENT EXTRACTED WITH A SOLVENT HAVING PREFERENTIAL SOLUBILITY FOR AROMATICS TO REDUCE THE POLYCYCLIC AROMATIC CONTENT THEREOF AND WHEREIN RAFFINATE FROM SAID EXTRACTION IS HYDROCRACKED UNDER CONDITIONS TO INCREASE THE VISCOSITY INDEX THEREOF AND WHEREIN HYDROCRACKED LUBRICATION OIL PRODUCT IS SUBJECTED TO A SECOND
Inventors
- 👤 William W Wentzheimer
- 👤 Ronald W Reynolds
- 👤 William Chalpin
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |