US2643217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high viscosity index lubricating oils
Assignee: Standard Oil Development Co
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Filing: 1952-03-26
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Granted: 1953-06-23
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Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 Albert T Watson
- 👤 Sam H Hastings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:11
CPC Classifications
C; C10; C10G; C10G25/00; C10G71/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
216 words
A METHOD FOR PRODUCING A HIGH VISCOSITY LUBRICATING OIL WHICH COMPRISES ALTERNATELY CHARGING TO A BED OF SILICA GEL A LUBRICATING OIL FRACTION CONTAINING PARAFFINIC, SINGLE AND CONDENSED RING NAPHTHENIC, AND SINGLE AND CONDENSED RING AROMATIC HYDROCARBONS AND AN AROMATIC HYDROCARBON FRACTION OF A BOILING POINT LOWER THAN THAT OF THE LUBRICATING OIL FRACTION, ALTERNATELY RECOVERING FROM THE BEDOF SILICA GEL A FIRST FRACTION CONTAINING PREDOMINANTLY SATURATED LUBRICATING OIL COMPONENTS AND A SECOND FRACTION CONTAINING PREDOMINANTLY AROMATIC LUBRICATING OIL COMPONENTS, ALTERNATELY CHARGING TO A BED OF ACTIVATED CARBON THE FIRST FRACTION AND A PARAFFINIC HYDROCARBON FRACTION OF A BOILING POINT LOWER THAN THAT OF THE AROMATIC HYDROCARBON FRACTION, ALTERNATELY RECOVERING FROM THE BED OF ACTIVATED CARBON A THIRD FRACTION CONTAINING CONDENSED RING NAPHTHENIC LUBRICATING OIL COMPONENTS AND A FOURTH FRACTION CONTAINING PARAFFINIC AND SINGLE RING NAPHTHENIC LUBRICATING OIL COMPONENTS, ALTERNATELY CHARGING TO A BED OF ALUMINA GEL THE SECOND FRACTION AND AN AROMATIC HYDROCARBON FRACTION HAVING A BOILING POINT LOWER THAN THE LUBRICATING OIL FRACTION, ALTERNATELY RECOVERING FROM THE BED OF ALUMINA GEL A FIFTH FRACTION CONTAINING SINGLE RING AROMATIC LUBRICATING OIL COMPONENTS AND A SIXTH FRACTION CONTAINING CONDENSED RING AROMATIC LUBRICATING OIL COMPONENTS, COMBINING SAID FOURTH AND FIFTH FRACTIONS, AND RECOVERING FROM SAID COMBINED FOURTH AND FIFTH FRACTIONS A LUBRICATING OIL OF HIGH VISCOSITY INDEX.
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |