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:
Nov. 18, 2008
Filed:
Nov. 07, 2005
Yojiro Hotta, Mishima, JP;
Tetsuya Ida, Mishima, JP;
Wakashi Iida, Toride, JP;
Akira Hashimoto, Shizuoka-ken, JP;
Nozomu Komatsu, Susono, JP;
Yoshinobu Baba, Yokohama, JP;
Yojiro Hotta, Mishima, JP;
Tetsuya Ida, Mishima, JP;
Wakashi Iida, Toride, JP;
Akira Hashimoto, Shizuoka-ken, JP;
Nozomu Komatsu, Susono, JP;
Yoshinobu Baba, Yokohama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
In a carrier comprising carrier particles; each carrier particle comprising a carrier core and a coat layer for coating the carrier core, the carrier core has a ferrite component containing i) a metal oxide having at least one of metallic elements Mg, Li and Ca, the total-sum content of which is 10 to 40 mole % based on the whole ferrite component, and ii) a metal oxide having at least one of metallic elements Mn, Cu, Cr and Zn, the total-sum content of which is 50 to 4,000 ppm based on the whole ferrite component. The carrier has a volume distribution based 50% particle diameter (D50) of from 15.0 to 55.0 μm and a degree of surface unevenness of from 1.05 to 1.30, and the coat layer contains particles; the particles having a number-average primary particle diameter of from 10 to 500 nm.