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:
Jun. 12, 2018
Filed:
Jan. 20, 2016
Grease, rolling bearing, rolling bearing device, and information recording and reproducing apparatus
Seiko Instruments Inc., Chiba-shi, Chiba-ken, JP;
Akihiro Iino, Chiba, JP;
Yukihiro Nakayama, Chiba, JP;
Misato Hanaoka, Chiba, JP;
Hisaya Nakamura, Sodegaura, JP;
Hiroki Yoda, Sodegaura, JP;
SEIKO INSTRUMENTS INC., , JP;
Abstract
Grease comprises a base oil and a thickener. The base oil contains mineral oil and poly-α-olefin, the proportion of the mineral oil is 10% by mass to 40% by mass in 100% by mass of the base oil, and a kinematic viscosity vof the mineral oil at 40° C. is higher than a kinematic viscosity vof the poly-α-olefin at 40° C. The base oil comprises a refined mineral oil that is classified as Group III in a base oil category defined by the American Petroleum Institute, and the flash point of the refined mineral oil is 240° C. or higher. A rolling bearing contains the grease, a rolling bearing device includes a shaft supported by the rolling bearing device, and an information recording and reproducing apparatus includes the rolling bearing device.