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:
Sep. 08, 2026
Filed:
Nov. 16, 2023
Canon Kabushiki Kaisha, Tokyo, JP;
Yukihiro Abe, Chiba, JP;
Ichiro Kanno, Chiba, JP;
Junichi Tamura, Ibaraki, JP;
Mari Kaburagi, Chiba, JP;
Hayato Ida, Ibaraki, JP;
Masao Suzuki, Kanagawa, JP;
Kei Inoue, Kanagawa, JP;
Waka Hasegawa, Tokyo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The external additive for toner includes an external additive particle containing: a fine particle A; and a plurality of fine particles B that are each present so as to partially protrude from a surface of the fine particle A, wherein the fine particle A (i) is a particle of an organosilicon compound having a siloxane bond, (ii) has a number-average particle diameter of 0.03 μm or more and 0.30 μm or less, and (iii) has an average circularity of 0.90 or more, wherein, when the number-average particle diameter of the fine particle A is represented by D, and a number-average particle diameter of the plurality of fine particles B is represented by D, D/Dis 0.10 or more and 0.63 or less.