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. 30, 2014
Filed:
Aug. 07, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Yoshinobu Baba, Yokohama, JP;
Koh Ishigami, Abiko, JP;
Masayuki Hama, Toride, JP;
Kentaro Kamae, Kashiwa, JP;
Hiroaki Kawakami, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is a magnetic carrier excellent in leakage, uniformity of a solid image having satisfactory charging stability and developing performance at low electric field. The magnetic carrier is a magnetic carrier comprising: a magnetic substance-dispersed resin carrier core, which contains a magnetic substance and a binding resin, and a coating resin on a surface thereof, wherein: the carrier core has resistivity at 1000 V/cm of 5.0×10-8.0×10Ω·cm, the magnetic substance has a number average particle diameter of 0.20-0.35 μm; and comprises magnetic-substance particles having vertexes and a particle diameter of 0.53 μm or more in an amount of 10.0-32.0 vol % based on a total amount of the magnetic substance; and wherein: the carrier core has FeOcontent of 98.00% by mass or more; and ZnO content of 0.06-0.50% by mass.