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:
Mar. 21, 2017
Filed:
Mar. 25, 2014
Applicant:
Jx Nippon Oil & Energy Corporation, Chiyoda-ku, Tokyo, JP;
Inventors:
Assignee:
JX NIPPON OIL & ENERGY CORPORATION, Chiyoda-Ku, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10M 145/14 (2006.01); C10M 169/04 (2006.01);
U.S. Cl.
CPC ...
C10M 145/14 (2013.01); C10M 169/041 (2013.01); C10M 2203/1006 (2013.01); C10M 2203/1025 (2013.01); C10M 2207/026 (2013.01); C10M 2209/084 (2013.01); C10M 2223/041 (2013.01); C10N 2220/021 (2013.01); C10N 2220/022 (2013.01); C10N 2230/02 (2013.01); C10N 2230/06 (2013.01); C10N 2230/43 (2013.01); C10N 2230/68 (2013.01); C10N 2240/08 (2013.01);
Abstract
The present invention provides a hydraulic oil composition comprising: a lubricating base oil having a kinematic viscosity at 40° C. of 15 to 50 mm/s; and 1 to 40% by mass, based on a total amount of the hydraulic oil composition, of a polymethacrylate having a number-average molecular weight of 48000 or lower, the hydraulic oil composition having a viscosity index of 150 or higher, and a ratio (A/B) at 60 to 80° C. of (A) a kinematic viscosity (unit: mm/s) to (B) a shear viscosity (unit: mPa·s, shear condition: 10/s) of 1.3 or lower.