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. 24, 2012
Filed:
Mar. 23, 2009
Kazuo Tagawa, Yokohama, JP;
Shinichi Shirahama, Yokohama, JP;
Masahiro Taguchi, Yokohama, JP;
JX Nippon Oil & Energy Corporation, Tokyo, JP;
Abstract
The lubricating base oil of the invention has a urea adduct value of not greater than 4% by mass, a kinematic viscosity at 40° C. of 25-50 mm/s, a viscosity index of 140 or greater, a CCS viscosity at −35° C. of not greater than 15,000 mPa·s and a flash point of 250° C. or higher. The method for producing a lubricating base oil of the invention comprises a step of hydrocracking/hydroisomerizing a feedstock oil containing normal paraffins so as to obtain a treated product having an urea adduct value of not greater than 4% by mass, a kinematic viscosity at 40° C. of 25-50 mm/s, a viscosity index of 140 or greater, a CCS viscosity at −35° C. of not greater than 15,000 mPa·s and a flash point of 250° C. or higher. The lubricating oil composition of the invention comprises the lubricating base oil of the invention.