Patent US2965572A successfully refreshed from Google Patents.
US2965572A
Expired / Lapsed
US
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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
- 👤 Cecil G Brannen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:36
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F259/00; C08F259/02; C08F265/00; C08F265/04; C08F265/06; C10M2203/00; C10M2203/10; C10M2203/108; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 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 HYDROCARBON LUBRICATING OIL, OF A GRAFT COPOLYMER PRODUCT PREPARED BY POLYMERIZING A MIXTURE OF AN AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE, ISOPROPYL STYRENE, AND ISOPROPYL-A-METHYLSTYRENE AND A FIRST ESTER (I) SELECTED FROM THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES WHEREIN THE ALKYL GROUPS CONTAIN AT LEAST 4 CARBON ATOMS TO FORM A BACKBONE COPOLYMER OF SAID AROMATIC COMPOUND AND SAID FIRST ESTER HAVING A MOLAR RATIO OF SAID FIRST ESTER TO SAID AROMATIC COMPOUND WITHIN THE RANGE OF FROM ABOUT 1:1 TO ABOUT 50:1 AND A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 5,000 TO 75,000, HYDROPEROXIDING SAID BACKBONE COPOLYMER AND REACTING THE HYDROPEROXIDIZED BACKBONE COPOLYMER WITH A SECOND ESTER (II) SELECTED FROM THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES WHEREIN THE ALKYL GROUPS CONTAIN AT LEAST 4 CARBON ATOMS TO FORM A GRAFT COPOLYMER PRODUCT HAVING A MOLAR RATIO OF SAID FIRST ESTER TO SAID AROMATIC COMPOUND TO SAID SECOND ESTER OF FROM ABOUT 1:1:1 TO ABOUT 50:1:50 AND HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM ABOUT 20,000 TO ABOUT 150,000.
Claim 2
Dependent Claim
206 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 HYDROCARBON LUBRICATING OIL, OF A GRAFT COPOLYMER PRODUCT PREPARED BY POLYMERIZING A MIXTURE OF AN AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE, ISOPROPYL STYRENE, AND ISOPROPYL-A-METHYLSTYRENE AND A FIRST ESTER (I) SELECTED FROM THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES WHEREIN THE ALKYL GROUPS CONTAIN AT LEAST 4 CARBON ATOMS TO FORM A BACKBONE COPOLYMER OF SAID AROMATIC COMPOUND AND SAID FIRST ESTER HAVING A MOLAR RATIO OF SAID FIRST ESTER TO SAID AROMATIC COMPOUND WITHIN THE RANGE OF FROM ABOUT 1:1 TO ABOUT 50:1 AND A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 5,000 TO 75,000, HYDROPEROXIDING SAID BACKBONE COPOLYMER AND REACTING THE HYDROPEROXIDIZED BACKBONE COPOLYMER WITH A SECOND ESTER (II) SELECTED FROM THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES WHEREIN THE ALKYL GROUPS CONTAIN AT LEAST 4 CARBON ATOMS TO FORM A GRAFT COPOLYMER PRODUCT HAVING A MOLAR RATIO OF SAID FIRST ESTER TO SAID AROMATIC COMPOUND TO SAID SECOND ESTER OF FROM ABOUT 1:1:1 TO ABOUT 50:1:50 AND HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM ABOUT 20,000 TO ABOUT 150,000.
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 |