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. 28, 2026
Filed:
Apr. 18, 2022
Ryohei Yamaguchi, Shizuoka, JP;
Ryuuta Yoshida, Kanagawa, JP;
Yoshiyasu Adachi, Kanagawa, JP;
Kazumasa Tabata, Shizuoka, JP;
Akira Tanaka, Shizuoka, JP;
Ryohei Yamaguchi, Shizuoka, JP;
Ryuuta Yoshida, Kanagawa, JP;
Yoshiyasu Adachi, Kanagawa, JP;
Kazumasa Tabata, Shizuoka, JP;
Akira Tanaka, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner includes toner base particles. Each of the toner base particles includes a binder resin, a colorant, and inorganic filler. An atomic concentration % of Al in the toner base particles as measured by XRF is 0.35 or greater but 0.85 or less. The toner satisfies 0.8<(M1/M2)/(M3/M4)<1.2. M1 is an atomic concentration % of Al in the toner base particles as measured by XPS, M2 is the atomic concentration % of Al in the toner base particles as measured by XRF, and M3 is an atomic concentration % of Al in particles as measured by XPS, and M4 is an atomic concentration % of Al in the particles as measured by XRF. The particles are particles obtained by classifying the toner base particles into 6/5 Dv, and Dv is a volume average particle diameter of the toner base particles.