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:
Oct. 14, 2008
Filed:
Jan. 10, 2005
Shigenori Yaguchi, Hitachinaka, JP;
Junji Kobayashi, Hitachinaka, JP;
Tomonari Hokkyo, Hitachinaka, JP;
Hirobumi Ouchi, Mito, JP;
Shigenori Yaguchi, Hitachinaka, JP;
Junji Kobayashi, Hitachinaka, JP;
Tomonari Hokkyo, Hitachinaka, JP;
Hirobumi Ouchi, Mito, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
An electrophotographic toner comprising at least a fixing resin, a coloring agent, a release agent and a charge control agent, wherein the release agent is carnauba wax, the charge control agent is a boron complex of a salicylic acid derivative, and the fixing resin contains two kinds of polyester resins in ratio represented by the following equation (1); wherein in the above equation, A(T)−A(T)<B(T)−B(T), A(T) represents a softening point (° C.) of the polyester A, A(T) a flow-out start point (° C.) of the polyester A, B(T) a softening point (° C.) of the polyester B, B(T) a flow-out start point (° C.) of the polyester B, C a weight rate of the polyester A in the fixing resin, and D a weight rate of the polyester B in the fixing resin.