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:
Sep. 29, 2015
Filed:
Jul. 01, 2013
Toyoshi Sawada, Kanagawa, JP;
Shigenori Yaguchi, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Yumiko Yagi, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Shigenori Yaguchi, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Yumiko Yagi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 Ωcm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.