US2695865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of mineral oils
Assignee: Sunoco Inc
•
Filing: 1950-04-18
•
Granted: 1954-11-30
•
Expires: 1970-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ivor W Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:29
CPC Classifications
C; C10; C10G; C10G21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
METHOD WHICH COMPRISES SOLVENT EXTRACTING A LUBRICATING OIL STOCK DERIVED FROM MIXED BASE CRUDE OIL TO SEPARATE AN AROMATIC-RICH EXTRACT, BLENDING SAID AROMATICRICH EXTRACT, ESSENTIALLY FREE OF SOLVENT, WITH A LUBRICATING OIL STOCK AS OBTAINED BY DISTILLATION FROM NAPHTHENIC BASE CRUDE OIL AND HAVING A VISCOSITY INDEX WHICH IS RELATIVELY LOW COMPARED TO THAT OF THE FIRST-MENTIONED STOCK BUT HIGHER THAN THAT OF SAID AROMATIC-RICH EXTRACT AND THEN SOLVENT EXTRACTING THE BLEND TO OBTAIN AN AROMATIC-RICH EXTRACT AND RAFFINATE PRODUCT WHEREBY SAID RAFFINATE PRODUCT HAS A HIGHER VISOCITY INDEX THAN IS OBTAINABLE FOR THE SAME AMOUNT OF RAFFINATE PRODUCT, FROM THE LAST, NAMED LUBRICATING OIL STOCK ALONE.
Claim 2
Dependent Claim
107 words
METHOD WHICH COMPRISES SOLVENT EXTRACTING A LUBRICATING OIL STOCK DERIVED FROM MIXED BASE CRUDE OIL TO SEPARATE AN AROMATIC-RICH EXTRACT, BLENDING SAID AROMATICRICH EXTRACT, ESSENTIALLY FREE OF SOLVENT, WITH A LUBRICATING OIL STOCK AS OBTAINED BY DISTILLATION FROM NAPHTHENIC BASE CRUDE OIL AND HAVING A VISCOSITY INDEX WHICH IS RELATIVELY LOW COMPARED TO THAT OF THE FIRST-MENTIONED STOCK BUT HIGHER THAN THAT OF SAID AROMATIC-RICH EXTRACT AND THEN SOLVENT EXTRACTING THE BLEND TO OBTAIN AN AROMATIC-RICH EXTRACT AND RAFFINATE PRODUCT WHEREBY SAID RAFFINATE PRODUCT HAS A HIGHER VISOCITY INDEX THAN IS OBTAINABLE FOR THE SAME AMOUNT OF RAFFINATE PRODUCT, FROM THE LAST, NAMED LUBRICATING OIL STOCK ALONE.
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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) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |