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US2965571A
Expired / Lapsed
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Lubricant composition
Assignee: Standard Oil Co
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Filing: 1957-04-30
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Granted: 1960-12-20
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Expires: 1977-04-30
Abstract
No abstract record available.
Inventors
- 👤 James A Wuellner
- 👤 Roger W Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:05
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/18; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF A HYDROCARBON LUBRICATING OIL AND A SMALL PROPORTION, SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID HYDROGEN LUBRICATING OIL, OF A GRAFT COPOLYMER PRODUCT PREPARED BY POLMERIZING A MIXTURE OF AN ETHYLENICALLY SUBSTITUTED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE, ISOPROPYL STYRENE AND ISOPROPYL-AMETHYL STYRENE, AND AN ALKENE SELECTED FROM THE GROUP CONSISTING OF COPYLENE AND ISOBUTYLENE, TO FORM A BACKBONE COPOLYMER OF SAID AROMATIC COMPOUND AND SAID ALKENE HAVING A MOLAR RATIO OF SAID AROMATIC COMPOUND TO SAID ALKENE OF FROM ABOUT 1:1 TO ABOUT 1:50 AND A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 5,000 TO ABOUT 75,000 HYDROPEROXIDIZING SAID BACKBONE COPOLYMER, AND REACTING THE HYDROPEROXIDIZED BACKBONE COPOLYMER WITH AN ACRYLIC MONOMER HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
129 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF A HYDROCARBON LUBRICATING OIL AND A SMALL PROPORTION, SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID HYDROGEN LUBRICATING OIL, OF A GRAFT COPOLYMER PRODUCT PREPARED BY POLMERIZING A MIXTURE OF AN ETHYLENICALLY SUBSTITUTED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE, ISOPROPYL STYRENE AND ISOPROPYL-AMETHYL STYRENE, AND AN ALKENE SELECTED FROM THE GROUP CONSISTING OF COPYLENE AND ISOBUTYLENE, TO FORM A BACKBONE COPOLYMER OF SAID AROMATIC COMPOUND AND SAID ALKENE HAVING A MOLAR RATIO OF SAID AROMATIC COMPOUND TO SAID ALKENE OF FROM ABOUT 1:1 TO ABOUT 1:50 AND A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 5,000 TO ABOUT 75,000 HYDROPEROXIDIZING SAID BACKBONE COPOLYMER, AND REACTING THE HYDROPEROXIDIZED BACKBONE COPOLYMER WITH AN ACRYLIC MONOMER HAVING THE GENERAL FORMULA
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |