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:
Jan. 19, 2016
Filed:
Jun. 13, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Yusuke Hasegawa, Suntou-gun, JP;
Takashi Matsui, Mishima, JP;
Shuichi Hiroko, Tokyo, JP;
Yoshitaka Suzumura, Mishima, JP;
Atsuhiko Ohmori, Suntou-gun, JP;
Keisuke Tanaka, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A toner comprising toner particles which comprise a binder resin and a colorant, and also inorganic fine particles as external additives, wherein the inorganic fine particles are silica fine particles and a group 2 element titanate fine particles, the inorganic fine particles have specific particle diameters, the silica fine particles have a coverage ratio X1 on the surfaces of the toner particles, which is not less than 40.0 surface area % and not more than 75.0 surface area %, when the theoretical coverage ratio by the silica fine particles is X2, the diffusion index defined as 'diffusion index=X1/X2' satisfies the condition: diffusion index≧−0.0042×X1+0.62, and the external additives have an embedding ratio on the toner particles, which satisfies a specific range.