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:
Nov. 18, 2014
Filed:
Mar. 31, 2011
Tadashi Kuratomi, Kitakyushu, JP;
Katsumi Nagano, Tokyo, JP;
Tadashi Kuratomi, Kitakyushu, JP;
Katsumi Nagano, Tokyo, JP;
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Abstract
A lubricating oil base oil includes, as a major component, a diester represented by the following formula (1), and a lubricating oil composition including the lubricating oil base oil. In the formula, Rand Reach independently represent a 1-ethylpentyl group, an n-heptyl group, or a n-hexyl group. When the diester in which both of Rand Reach represent an n-heptyl group or an n-hexyl group is defined as A, the diester in which one of Rand Rrepresents a 1-ethylpentyl group is B, and the diester in which both of Rand Reach represent a 1-ethylpentyl group is defined as C, the molar ratio of the diesters falls within a range of A:B:C=25 to 65:30 to 50:3 to 25. The lubricating oil base oil is suitable for a fluid dynamic pressure bearing, an oil-impregnated porous bearing, or a dynamic pressure-type oil-impregnated porous bearing.