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:
May. 03, 2011
Filed:
Nov. 18, 2008
Tadashi Dojo, Numazu, JP;
Michihisa Magome, Mishima, JP;
Eriko Yanase, Suntou-gun, JP;
Takashi Matsui, Suntou-gun, JP;
Tomohisa Sano, Suntou-gun, JP;
Akira Sakakibara, Susono, JP;
Shuichi Hiroko, Susono, JP;
Tadashi Dojo, Numazu, JP;
Michihisa Magome, Mishima, JP;
Eriko Yanase, Suntou-gun, JP;
Takashi Matsui, Suntou-gun, JP;
Tomohisa Sano, Suntou-gun, JP;
Akira Sakakibara, Susono, JP;
Shuichi Hiroko, Susono, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a magnetic toner which has magnetic toner base particles containing at least a binder resin and a magnetic material, and an inorganic fine powder, (i) the magnetic toner has an average circularity of from 0.950 or more to 1.000 or less, (ii) the magnetic toner has a compressibility of 30 or less, and (iii) the magnetic toner contains boron nitride particles having a median diameter (D50) of from 0.5 μm or more to 8.0 μm or less, as the inorganic fine powder in an amount of from 0.05 part by mass or more to 1.00 part by mass or less based on 100 parts by mass of the magnetic toner base particles. This provides a magnetic toner with which stable image density can be achieved without regard to service environment and which do not cause any image defects such as fog.