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:
Feb. 24, 2026
Filed:
Mar. 29, 2022
Applicant:
Idemitsu Kosan Co.,ltd., Chiyoda-ku, JP;
Inventor:
Masashi Nakamura, Yokkaichi, JP;
Assignee:
IDEMITSU KOSAN CO. , LTD., Chiyoda-ku, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10M 101/02 (2006.01); C10N 40/20 (2006.01);
U.S. Cl.
CPC ...
C10M 101/02 (2013.01); C10N 2040/20 (2013.01);
Abstract
A quench oil may be excellent in thermal stability and may be capable of retaining the brightness for a prolonged period of time. Such a quench oil may contain a base oil containing a mineral oil (A), the mineral oil (A) having a 40° C. kinematic viscosity of 100 to 600 mm/s and a sulfur content of 0.10 to 0.20% by mass, the base oil having a content of the mineral oil (A) of more than 0.5% by mass, based on the total amount of the base oil.