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:
Oct. 13, 2009
Filed:
Sep. 12, 2006
Takeshi Katoh, Kyoto, JP;
Toshihisa Ishida, Kashiba, JP;
Yoshinori Urata, Kashihara, JP;
Kazuya Korematu, Nara, JP;
Takeshi Takayama, Yamatokoriyama, JP;
Mitsuhiro Hasegawa, Kyoto, JP;
Takeshi Katoh, Kyoto, JP;
Toshihisa Ishida, Kashiba, JP;
Yoshinori Urata, Kashihara, JP;
Kazuya Korematu, Nara, JP;
Takeshi Takayama, Yamatokoriyama, JP;
Mitsuhiro Hasegawa, Kyoto, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A two-component developing agent containing a carrier which can maintain a charge-imparting property to a toner at a high level for a long period of time, does not generate flying of the carrier and can correspond to an image forming apparatus of present day having a long operation life and can form a high-quality image having high image density and sharpness, is provided. In the two-component developing agent containing a carrier in which a resin coating layer is formed on a surface of a core material, and a toner, in which an X-ray intensity of an alumina particle by a fluorescent X-ray analysis, the amount of the alumina particle to be used to the resin coating layer is adjusted such that it comes to be smaller than the X-ray intensity by the fluorescent X-ray analysis of a metal contained in a largest amount in the core material.