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. 20, 2013
Filed:
Sep. 10, 2010
Hitoshi Iwatsuki, Shizuoka, JP;
Kimitoshi Yamaguchi, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Yutaka Takahashi, Kanagawa, JP;
Koichi Sakata, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Kimitoshi Yamaguchi, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Yutaka Takahashi, Kanagawa, JP;
Koichi Sakata, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A latent electrostatic image developing carrier including a carrier core material, and a coating layer containing a resin and provided on a surface of the carrier core material, wherein the coating layer includes a particulate material containing at least first fine conductive particles and second fine conductive particles, and wherein the first fine conductive particles and the second fine conductive particles satisfy the relationships expressed by Expressions 1 and 2, 3≦D1/D2≦15 . . . Expression 1, where D1 denotes a dispersed particle diameter of the first fine conductive particles and D2 denotes a dispersed particle diameter of the second fine conductive particles, and −7E≦R1×R2≦8E . . . Expression 2, where R1 denotes a powder specific resistance of the first fine conductive particles and R2 denotes a powder specific resistance of the second fine conductive particles.