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:
Feb. 28, 2012
Filed:
Apr. 25, 2007
Junko Hirata, Suntou-gun, JP;
Yoshihiro Ogawa, Yokohama, JP;
Yusuke Hasegawa, Suntou-gun, JP;
Kouji Nishikawa, Suntou-gun, JP;
Miho Okazaki, Suntou-gun, JP;
Takashige Kasuya, Suntou-gun, JP;
Junko Hirata, Suntou-gun, JP;
Yoshihiro Ogawa, Yokohama, JP;
Yusuke Hasegawa, Suntou-gun, JP;
Kouji Nishikawa, Suntou-gun, JP;
Miho Okazaki, Suntou-gun, JP;
Takashige Kasuya, Suntou-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan δ) of the magnetic toner at 100 kHz and 40° C. is 2.0×10to 1.0×10.