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:
Oct. 15, 2013
Filed:
Apr. 25, 2008
Applicants:
Hirotaka Yamasaki, Ichihara, JP;
Motoharu Ishikawa, Ichihara, JP;
Inventors:
Hirotaka Yamasaki, Ichihara, JP;
Motoharu Ishikawa, Ichihara, JP;
Assignee:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10M 125/04 (2006.01); C10M 125/24 (2006.01); C10M 169/04 (2006.01); F01M 9/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The lubricating oil composition contains a base oil, a phosphate ester derivative represented by a formula (1) below and a zinc compound. An element ratio (Zn/P) between zinc (Zn) and phosphorus (P) in the lubricating oil composition is 0.55 or more at a mole ratio. In the formula, Y represents S (sulfur) or O (oxygen); Rrepresents an organic group having 4 to 24 carbon atoms; Rrepresents a divalent organic group having 1 to 6 carbon atoms; and n represents an integer of 1 to 3.