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. 21, 1995
Filed:
Sep. 10, 1992
Akira Yamazaki, Saitama, JP;
Setsuo Yoshida, Okazaki, JP;
Tatsuo Yoshioka, Toyota, JP;
Isamu Kawaji, Saitama, JP;
Tadamori Sakakibara, Saitama, JP;
Tonen Corp., Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A lubricating oil composition comprising a base oil and, incorporated therein, a phosphoric acid ester, phosphorous acid ester, phosphoric acid ester amine salt or phosphorous acid ester amine salt, an aliphatic dicarboxylic acid compound, and an alkylamine compound and/or primary zinc thiophosphate, succinimide or perbasic magnesium or calcium sulfonate. The change with the lapse of time of the friction coefficient of this lubricating oil composition is small and the friction coefficient is stable, and the change of the friction coefficient by the change of the oil temperature is small. By dint of such excellent characteristics, this lubricating oil composition is especially valuable as a lubricating oil for an automatic transmission of an automobile.