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. 09, 2008
Filed:
Feb. 23, 2005
Hitomi Akiyama, Minamiashigara, JP;
Takashi Hara, Minamiashigara, JP;
Kazuya Mori, Minamiashigara, JP;
Junichi Tomonaga, Minamiashigara, JP;
Yuji Isshiki, Minamiashigara, JP;
Takahiro Mizuguchi, Minamiashigara, JP;
Satoshi Yoshida, Minamiashigara, JP;
Eiji Kawakami, Minamiashigara, JP;
Michio Take, Minamiashigara, JP;
Takao Ishiyama, Minamiashigara, JP;
Hitomi Akiyama, Minamiashigara, JP;
Takashi Hara, Minamiashigara, JP;
Kazuya Mori, Minamiashigara, JP;
Junichi Tomonaga, Minamiashigara, JP;
Yuji Isshiki, Minamiashigara, JP;
Takahiro Mizuguchi, Minamiashigara, JP;
Satoshi Yoshida, Minamiashigara, JP;
Eiji Kawakami, Minamiashigara, JP;
Michio Take, Minamiashigara, JP;
Takao Ishiyama, Minamiashigara, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1): Here, each of R, R, R, and Ris selected from the group consisting of H, CH, and Cl, Rand Rare different from each other, and Rand Rare different from each other. Formula (2):