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:
Dec. 19, 2006
Filed:
Sep. 12, 2003
Katsuhisa Yamazaki, Shizuoka, JP;
Takashige Kasuya, Shizuoka, JP;
Tsuyoshi Takiguchi, Shizuoka, JP;
Kaori Hiratsuka, Shizuoka, JP;
Katsuhisa Yamazaki, Shizuoka, JP;
Takashige Kasuya, Shizuoka, JP;
Tsuyoshi Takiguchi, Shizuoka, JP;
Kaori Hiratsuka, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developer capable of providing an excellent image without causing a charging failure even after a long-term and repeated use contains a toner particle having a binder resin and a colorant, an inorganic fine particle, and a conductive fine particle, in which a volume average particle diameter Da of the conductive fine particle and an number average primary particle diameter Db of the inorganic fine particle satisfy the expression (1) below, and a rate of liberation 'a' of the conductive fine particle from the toner particle is 40 to 95% and a rate of liberation 'b' of the inorganic fine particle from the toner particle is 0.1 to 5%Da≧10Db.   (1)