The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2012
Filed:
Dec. 24, 2007
Keiichi Moriki, Tokyo, JP;
Eiji Nagatomi, Tokyo, JP;
Kenji Ueno, Toyota, JP;
Koji Saito, Toyota, JP;
Kiyonari Ishikawa, Toyota, JP;
Hiroshi Fujito, Toyota, JP;
Keiichi Moriki, Tokyo, JP;
Eiji Nagatomi, Tokyo, JP;
Kenji Ueno, Toyota, JP;
Koji Saito, Toyota, JP;
Kiyonari Ishikawa, Toyota, JP;
Hiroshi Fujito, Toyota, JP;
Shell Oil Company, Houston, TX (US);
Abstract
The present invention provides a lubricating oil composition comprising a mixture of both a poly-alpha-olefin and an ester compound, the lubricating oil composition having an SAE viscosity grade of 75W-85, satisfying GL-5 in terms of API gear oil designation and having a viscosity index of 160 or more. The above mixture of the poly-alpha-olefin and ester compound is preferably contained in an amount of from 75 to 90 wt % with reference to the total amount of the lubricating oil composition. The poly-alpha-olefin is preferably a mixture of a poly-alpha-olefin having low viscosity of from about 3 to 6 mm/s at 100° C. and a poly-alpha-olefin having high viscosity of from about 35 to 45 mm/s at 100° C.