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:
Feb. 22, 2022
Filed:
Dec. 26, 2018
Ricoh Company, Ltd., Tokyo, JP;
Akihiro Kaneko, Shizuoka, JP;
Kazumi Suzuki, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Yoshitaka Yamauchi, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Teruyuki Suzuki, Shizuoka, JP;
Namie Suzuki, Shizuoka, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
Provided is a toner including toner particles, each toner particle includes: a base particle including a binder resin; and external additive particles, wherein the external additive particles include particles each having an equivalent circle diameter of 10 nm or greater, a volume average particle diameter of the particles each having an equivalent circle diameter of 10 nm or greater is 80 nm or greater but 140 nm or less, and a ratio (circumscribed circle area/particle area) of a circumscribed circle area of the particle having an equivalent circle diameter of 10 nm or greater to a particle area of the particle having an equivalent circle diameter of 10 nm or greater is 1.60 or greater but 2.60 or less.