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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.:

US 12674112 B1

PDFFull Text
Date of Patent:
Jul. 07, 2026

Filed:

Jul. 21, 2021

Lubricating oil composition

Applicant:

Idemitsu Kosan Co.,ltd., Chiyoda-ku, JP;

Inventors:

Shota Kato, Chiba, JP;

Keiichi Narita, Chiba, JP;

Hiroaki Koshima, Chiba, JP;

Kenichi Ogata, Chiba, JP;

Assignee:

IDEMITSU KOSAN CO., LTD., Chiyoda-ku, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Cephia D Toomer

Int. Cl.
CPC ...
C10M 111/02 (2006.01); C10M 101/00 (2006.01); C10M 105/34 (2006.01); C10M 105/36 (2006.01); C10N 30/02 (2006.01); C10N 40/00 (2006.01); H02K 9/19 (2006.01);
U.S. Cl.
CPC ...
C10M 111/02 (2013.01); C10M 101/00 (2013.01); C10M 105/34 (2013.01); C10M 105/36 (2013.01); C10M 2203/1006 (2013.01); C10M 2207/2815 (2013.01); C10M 2207/2825 (2013.01); C10N 2030/02 (2013.01); C10N 2040/40 (2020.05); H02K 9/19 (2013.01);
Abstract

A lubricating oil composition may be superior in cooling performance, ensure electrical insulation, and have a high flash point. Such a lubricating oil composition may include a base oil (A) including an ester-based synthetic oil (A1), the content of the ester-based synthetic oil (A1) is 30% by mass to 100% by mass based on the total amount of the base oil (A), the ester-based synthetic oil (A1) is one or more of an ester (A1-1) of a monohydric alcohol and a monobasic acid and an ester (A1-2) of a monohydric alcohol and a polybasic acid, and the base oil (A) satisfies requirements (1) to (3): Requirement (1): the kinematic viscosity at 40° C. is 2.00 mm/s to 4.00 mm/s. Requirement (2): the specific heat at 20° C. is 1.75 kJ/(kg·K) or less. Requirement (3): the density at 20° C. is 0.850 g/cmor more.

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