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:
Jan. 09, 2007
Filed:
Apr. 06, 2004
Tadashi Dojo, Shizuoka, JP;
Nene Shibayama, Shizuoka, JP;
Yuichi Mizoo, Ibaraki, JP;
Yusuke Hasegawa, Shizuoka, JP;
Tadashi Dojo, Shizuoka, JP;
Nene Shibayama, Shizuoka, JP;
Yuichi Mizoo, Ibaraki, JP;
Yusuke Hasegawa, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a magnetic toner having toner particles containing at least a binder resin and a magnetic material, the binder resin is chiefly composed of a resin having a polyester unit synthesized using as a catalyst a tin compound represented by the following Formula (1), and the magnetic material has a number-average particle diameter of form 0.1 μm to 0.3 μm:(RCOO)Sn  Formula (1)wherein R represents an alkyl group having 5 to 15 carbon atoms. This magnetic toner can attain a stable image density without dependence on environment and enables formation of high-grade images over a long period of time without causing scratches of latent image bearing members.