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. 18, 2012
Filed:
Apr. 07, 2010
Hiroto Higuchi, Shizuoka-ken, JP;
Fumihiro Sasaki, Shizuoka-ken, JP;
Shinichiro Yagi, Shizuoka-ken, JP;
Shigeru Emoto, Shizuoka-ken, JP;
Junichi Awamura, Shizuoka-ken, JP;
Naohito Shimota, Shizuoka-ken, JP;
Masami Tomita, Shizuoka-ken, JP;
Toshiki Nanya, Shizuoka-ken, JP;
Takahiro Honda, Shizuoka-ken, JP;
Maiko Kondo, Shizuoka-ken, JP;
Hiroto Higuchi, Shizuoka-ken, JP;
Fumihiro Sasaki, Shizuoka-ken, JP;
Shinichiro Yagi, Shizuoka-ken, JP;
Shigeru Emoto, Shizuoka-ken, JP;
Junichi Awamura, Shizuoka-ken, JP;
Naohito Shimota, Shizuoka-ken, JP;
Masami Tomita, Shizuoka-ken, JP;
Toshiki Nanya, Shizuoka-ken, JP;
Takahiro Honda, Shizuoka-ken, JP;
Maiko Kondo, Shizuoka-ken, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The present invention relates to toner compositions containing: toner particles made of: binder resin; colorant; and a wax which is dispersed in the toner particles, where the toner composition satisfies relationship (2): B≦394−400A' when 0.950<A′≦0.965 (2) where A′ represents an average circularity of the toner composition, B represents a content of toner particles having a particle diameter not greater than 3 μm expressed in % by number, and a concentration of the wax at a surface of the toner particles is larger than a concentration thereof in the center of the toner particles.