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. 18, 2014
Filed:
Jul. 13, 2011
Kimitoshi Yamaguchi, Shizuoka, JP;
Shigenori Yaguchi, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Mariko Takii, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Toyoaki Tano, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Koichi Sakata, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Kimitoshi Yamaguchi, Shizuoka, JP;
Shigenori Yaguchi, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Mariko Takii, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Toyoaki Tano, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Koichi Sakata, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A contact developing method including supplying a two-component developer to an electrostatic latent image on a rotating image bearing member by rotating a developing sleeve and a rotatable magnet having multiple magnetic poles provided inside the developing sleeve, to develop the electrostatic latent image into a toner image. The developing sleeve and the image bearing member rotate in the same direction while facing each other. The two-component developer comprises a non-magnetic toner and a carrier. The carrier comprises a magnetic core particle and a resin layer covering the magnetic core particle. The resin layer comprises a conductive particle and a resin. The conductive particle comprises an alumina-based material and a conductive layer covering the alumina-based material. The resin is obtained by heating a copolymer comprising a monomer A unit and a monomer B unit.