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:
Aug. 15, 1989
Filed:
May. 02, 1988
Katsumi Hashimoto, Ichihara, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
A base oil for a lubricating oil and a lubricating oil composition containing said base oil, which are to be used in a mechanical apparatus with an orifice mechanism, are disclosed. The base oil has a kinematic viscosity at 40.degree. C. or 3 to 500 cSt, a pour point of -25.degree. C. or lower and a cloud point of -25.degree. C. or lower. The lubricating oil composition contains as major components (A) the above base oil and (B) at least one additive selected from a viscosity index improver, a pour point depressant, an extreme pressure agent, an anti-wear agent, an oiliness agent and an antioxidant. The base oil and the lubricating oil composition are excellent in working properties at low temperatures and thus can be effectively used in a mechanical apparatus with an orifice mechanism, particularly to be used at low temperatures.