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:
Jul. 22, 2014
Filed:
Jan. 25, 2010
Akira Yaguchi, Tokyo, JP;
Shigeki Matsui, Tokyo, JP;
Teppei Tsujimoto, Tokyo, JP;
JX Nippon Oil & Energy Corporation, Tokyo, JP;
Abstract
A lubricant oil composition comprising: a lubricant base oil whose kinematic viscosity at 100° C. is 1 to 6 mm/s, % Cis not less than 70, and % Cis not more than 2; a first viscosity index improver in which the ratio A/B of a viscosity increasing effect A in the equation (1) to a viscosity increasing effect B in the equation (2) when added to the lubricant base oil is a value of not less than 4.5, and a PSSI is not more than 30; and a second viscosity index improver in which the ratio A/B when added to the lubricant base oil is a value less than 4.5:  (1)  (2)wherein A represents a viscosity increasing effect of the kinematic viscosity at 100° C., B represents a viscosity increasing effect of the HTHS viscosity at 150° C., X represents a kinematic viscosity at 100° C. of a mixture of the lubricant base oil with 3% by mass of the first or second viscosity index improver, Xrepresents a kinematic viscosity at 100° C. of the lubricant base oil, Y represents an HTHS viscosity at 150° C. of a mixture of the lubricant base oil with 3% by mass of the first or second viscosity index improver, and Yrepresents an HTHS viscosity at 150° C. of the lubricant base oil.