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. 20, 2025
Filed:
Sep. 13, 2021
Canon Kabushiki Kaisha, Tokyo, JP;
Shintaro Kawaguchi, Kanagawa, JP;
Masamichi Sato, Shizuoka, JP;
Masatake Tanaka, Kanagawa, JP;
Ryo Sugiyama, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A process cartridge includes a toner, a regulating member, and a developing roller including a conductive substrate, an elastic layer, and a surface layer which includes a binder resin, a first resin particle having an elastic coefficient of 100 to 10,000 MPa, and a second resin particle having an elastic coefficient of 2 to 50 MPa and in which the outer surface has a first protruded portion and a second protruded portion 5.0 μm or more lower than the first protruded portion and has an average maximum height of 6 to 18 μm. The toner includes a toner particle and an external additive A that is a silica particle having a major diameter of 40 to 400 nm, a surface coverage of the toner particle by the external additive A is 3.0% or more, and a dispersion degree evaluation index D of the external additive A is 2.0 or less.