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:
Jul. 15, 2014
Filed:
Oct. 10, 2012
Kimitoshi Yamaguchi, Shizuoka, JP;
Shigenori Yaguchi, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Kimitoshi Yamaguchi, Shizuoka, JP;
Shigenori Yaguchi, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A carrier for developing an electrostatic latent image, including a particulate core material having a magnetism having developed spontaneous magnetization; and a covering layer comprising an electroconductive material, covering the surface of the particulate core material, wherein the carrier has an electrical resistivity Log R [Ωcm] of from 8.0 to 12.0 when measured by a method, including filling the carrier in a cell containing a pair of facing electrodes, each having a surface area of 2×4 [cm] with a gap of 2 [mm] therebetween; and applying a DC voltage of 1,000 [V] therebetween to measure a DC resistivity, and a weight-average particle diameter (Dw) of from 25 to 45 μm.