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. 28, 2020
Filed:
Jun. 26, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Tetsuya Kinumatsu, Mishima, JP;
Yusuke Hasegawa, Suntou-gun, JP;
Kosuke Fukudome, Tokyo, JP;
Tomohisa Sano, Mishima, JP;
Kenji Ookubo, Numazu, JP;
Yoshitaka Suzumura, Mishima, JP;
Takuma Ikejiri, Moriya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A magnetic toner is provided, which has a magnetic toner particle containing a binder resin, a wax, and a magnetic body, wherein, when Dn is a number-average particle diameter of the toner, CVis coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn −0.500 to +0.500, and CVis coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn −1.500 to −0.500, a relationship CV/CV≤1.00 is satisfied; an average brightness of the toner in the range of Dn −0.500 to +0.500 is 30.0 to 60.0; and when, in a cross section of the toner observed using a transmission electron microscope, which is divided with a square grid having a side of 0.8 μm, coefficient of variation CVof an occupied area percentage for the magnetic body is 40.0 to 80.0%.