US2756197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improving lubricating oils by adsorption
Assignee: Shell Development Co
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Filing: 1953-05-18
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Granted: 1956-07-24
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Roy E Thorpe
- 👤 Robert J Moore
- 👤 Mahoney Clarence Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:37
CPC Classifications
C; C10; C10G; C10G25/00; C10G71/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A METHOD OF PRODUCING A HIGH VISCOSITY INDEX LUBRICATING OIL WHICH COMPRISES CONTACTING A LUBRICATING OIL FRACTION WITH A SILICA GEL, THE GEL-TO-OIL RATIO BEING AT LEAST ABOUT 20:1, WHEREBY SUBSTANTIALLY ALL OF THE OIL FRACTION IS ADSORBED ON THE SILICA GEL, TREATING SAID SILICA GEL WITH A SATURATED NON-AROMATIC HYDROCARBON HAVING FROM ABOUT 3 TO ABOUT 10 CARBON ATOMS TO SEPARATELY DESORB FROM SAID SILICA GEL ALL OF THE SATURATED COMPONENTS OF THE LUBRICATING OIL FRACTION HAVING A REFRACTIVE INDEX (ND20) OF BELOT ABOUT 1.480 AS ONE FRACTION, AND DESORBING THE AROMATIC COMPONENTS OF THE LUBRICATING OIL FRACTION HAVING A REFRACTIVE INDEX (N1D20) OF BELOW ABOUT 1.515 SEPARATE FROM ALL OTHER COMPONENTS AS ANOTHER FRACTION, AND BLENDING SAID ONE FRACTION AND SAID OTHER FRACTION TO OBTAIN A HIGH VISCOSITY INDEX LUBRICATING OIL,
Claim 2
Independent Claim
133 words
A METHOD OF PRODUCING A HIGH VISCOSITY INDEX LUBRICATING OIL WHICH COMPRISES CONTACTING A LUBRICATING OIL FRACTION WITH A SILICA GEL, THE GEL-TO-OIL RATIO BEING AT LEAST ABOUT 20:1, WHEREBY SUBSTANTIALLY ALL OF THE OIL FRACTION IS ADSORBED ON THE SILICA GEL, TREATING SAID SILICA GEL WITH A SATURATED NON-AROMATIC HYDROCARBON HAVING FROM ABOUT 3 TO ABOUT 10 CARBON ATOMS TO SEPARATELY DESORB FROM SAID SILICA GEL ALL OF THE SATURATED COMPONENTS OF THE LUBRICATING OIL FRACTION HAVING A REFRACTIVE INDEX (ND20) OF BELOT ABOUT 1.480 AS ONE FRACTION, AND DESORBING THE AROMATIC COMPONENTS OF THE LUBRICATING OIL FRACTION HAVING A REFRACTIVE INDEX (N1D20) OF BELOW ABOUT 1.515 SEPARATE FROM ALL OTHER COMPONENTS AS ANOTHER FRACTION, AND BLENDING SAID ONE FRACTION AND SAID OTHER FRACTION TO OBTAIN A HIGH VISCOSITY INDEX LUBRICATING OIL,
Claim 3
Dependent Claim
85 words
A LUBRICATING OIL COMPOSITION CONSISTING ESSENTIALLY OF A BLEND OF SATURATED AND AROMATIC FRACTIONS DERIVED FROM A LUBRICATING OIL STOCK, ALL OF THE SATURATED COMPONENTS IN THE SATURATED FRACTIONS HAVING A REFRACTIVE INDEX (ND20) BELOW ABOUT 1.485 AND ALL OF THE AROMATIC COMPONENTS OF THE AROMATIC FRACTIONS HAVING A REFRACTIVE INDEX (ND20) BELOW ABOUT 1.525, SAID COMPOSITION BEING FREE OF SATURATED COMPONENTS HAVING A REFRACTIVE INDEX (ND20) SUBSTANTIALLY GREATER THAN 1.485 AND FREE OF AROMATIC COMPONENTS HAVING A REFRACTIVE INDEX (ND20) SUBSTANTIALLY GREATER THAN 1.525.
Claim 4
Dependent Claim
85 words
A LUBRICATING OIL COMPOSITION CONSISTING ESSENTIALLY OF A BLEND OF SATURATED AND AROMATIC FRACTIONS DERIVED FROM A LUBRICATING OIL STOCK, ALL OF THE SATURATED COMPONENTS IN THE SATURATED FRACTIONS HAVING A REFRACTIVE INDEX (ND20) BELOW ABOUT 1.485 AND ALL OF THE AROMATIC COMPONENTS OF THE AROMATIC FRACTIONS HAVING A REFRACTIVE INDEX (ND20) BELOW ABOUT 1.525, SAID COMPOSITION BEING FREE OF SATURATED COMPONENTS HAVING A REFRACTIVE INDEX (ND20) SUBSTANTIALLY GREATER THAN 1.485 AND FREE OF AROMATIC COMPONENTS HAVING A REFRACTIVE INDEX (ND20) SUBSTANTIALLY GREATER THAN 1.525.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |