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:
Apr. 27, 2021
Filed:
Sep. 26, 2019
Yuuya Takabayashi, Shizuoka, JP;
Junjiroh Sogame, Shizuoka, JP;
Shinya Nakagawa, Shizuoka, JP;
Katsuhiko Fujii, Shizuoka, JP;
Yuuya Takabayashi, Shizuoka, JP;
Junjiroh Sogame, Shizuoka, JP;
Shinya Nakagawa, Shizuoka, JP;
Katsuhiko Fujii, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A carrier for forming an electrophotographic image is provided. The carrier comprises carrier particles each comprising a core particle and a coating layer. The coating layer comprises a coating resin and inorganic particles comprising chargeable particles A and conductive particles B. The amount of the inorganic particles is from 195 to 350 parts by mass with respect to 100 parts by mass of the coating resin. The carrier particles consist of small carrier particles (D1≤25 μm), medium carrier particles (25 μm<D2≤38 μm), and large carrier particles (38 μm<D3). A constituent element variation, that is a ratio of an amount of a constituent element of the inorganic particles contained in the coating layer of the small carrier particles to an amount of the same constituent element of the inorganic particles contained in the coating layer of the medium carrier, is from −10.0% to 10.0%.