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:
May. 03, 2011
Filed:
Sep. 22, 2008
Koichi Kato, Kanagawa, JP;
Junichi Terai, Kanagawa, JP;
Kiyonori Tsuda, Kanagawa, JP;
Emi Kita, Tokyo, JP;
Satoru Yoshida, Kanagawa, JP;
Shinya Kikutani, Osaka, JP;
Takashi Tanaka, Osaka, JP;
Koichi Kato, Kanagawa, JP;
Junichi Terai, Kanagawa, JP;
Kiyonori Tsuda, Kanagawa, JP;
Emi Kita, Tokyo, JP;
Satoru Yoshida, Kanagawa, JP;
Shinya Kikutani, Osaka, JP;
Takashi Tanaka, Osaka, JP;
Ricoh Company Limited, Tokyo, JP;
STARLITE Co., Ltd., Osaka-shi, JP;
Abstract
A developing device includes a rotator that rotates around a shaft, and a bearing element that supports the shaft to a housing. A sliding element formed of a composite material that contains self-lubricating thermoplastic olefin resin as a base material is used as the bearing element. The sliding element formed of the composite material has at least a ratio of numerical values of 'Rockwell hardness'/'bending elastic modulus' in a range from 25 to 45, and provides a sliding surface of which a frictional coefficient is lower than that of the sliding element formed of the base material.