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:
Aug. 12, 2025
Filed:
Jan. 21, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Nobuhiro Yoshida, Chiba, JP;
Hironori Minagawa, Ibaraki, JP;
Yuzo Tokunaga, Chiba, JP;
Nobuyoshi Sugahara, Tokyo, JP;
Yuu Nishimura, Chiba, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnetic carrier, which is suppressed from causing the loss and wear of a magnetic carrier coating resin even when used for a long time period, and achieves a stable image density and a reduction in toner scattering. In the magnetic carrier, the resin coating layer contains a resin A having a fluorine polymer moiety, the resin coating layer has an average thickness of 50 nm or more, a ratio F(x) (atomic %) of a fluorine atom detected at a position at a depth of x nm from a surface of a magnetic carrier particle by X-ray photoelectron spectroscopy satisfies formula (1) and formula (2), and when x represents an integer of 0 or more and 20 or less, F(x) satisfies formula (3):5.0≤F(0)≤15 (1)F(20)≤5.0 (2)|F(+1)−F()|≤7.5 (3).