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. 09, 2025
Filed:
Jul. 06, 2022
Akinori Saitoh, Shizuoka, JP;
Akio Takei, Shizuoka, JP;
Toma Takebayashi, Shizuoka, JP;
Masahiro Yukikawa, Kanagawa, JP;
Tomomi Harashima, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Akinori Saitoh, Shizuoka, JP;
Akio Takei, Shizuoka, JP;
Toma Takebayashi, Shizuoka, JP;
Masahiro Yukikawa, Kanagawa, JP;
Tomomi Harashima, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner includes toner base particles and external additives deposited on a surface of the toner base particle. The toner base particle includes an amorphous polyester resin, a crystalline polyester resin, a release agent, and resin particles. An abundance ratio of the crystalline polyester resin in the surface of the toner base particle as observed by TEM is 2.5% or greater but 25% or less. The resin particles are deposited at the surface of the toner base particle as observed by SEM. A ratio of aggregates of the resin particles occupying the surface of the toner base particle is 1% or greater but 70% or less, where R is a major axis of the minimum particle of the resin particles, and the resin particle having a major axis of 3R or greater is determined as the aggregate.