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:
Nov. 23, 2010
Filed:
Feb. 01, 2007
Masayuki Hagi, Minoo, JP;
Takuya Kadota, Kobe, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Atsushi Yamamoto, Kawanishi, JP;
Katsunori Kurose, Takarazuka, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Masahide Inoue, Katsuragi, JP;
Hideaki Yasunaga, Ibaraki, JP;
Minoru Nakamura, Takarazuka, JP;
Yoshimichi Ishikawa, Itami, JP;
Hiroyuki Murakami, Toyonaka, JP;
Masayuki Hagi, Minoo, JP;
Takuya Kadota, Kobe, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Atsushi Yamamoto, Kawanishi, JP;
Katsunori Kurose, Takarazuka, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Masahide Inoue, Katsuragi, JP;
Hideaki Yasunaga, Ibaraki, JP;
Minoru Nakamura, Takarazuka, JP;
Yoshimichi Ishikawa, Itami, JP;
Hiroyuki Murakami, Toyonaka, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A toner including toner particles including a binder resin, a colorant and a release agent, and an external additive including a first particulate inorganic material having a formula of MgSiOwhere each of x and y is an integer, and a number average secondary particle diameter of from 0.02 μm to 2 μm, wherein the first atomic ratio (Mg/Si)s in a surface portion of the first particulate inorganic material is not greater than (preferably less than) the second atomic ratio (Mg/Si)e in the entire first particulate inorganic material. Alternatively, a toner including toner particles including a binder resin and a colorant, and an external additive which includes a particulate inorganic material having a formula of MgSiOwhere each of x and y is an integer and which has a surface treated with a fatty acid.