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:
Mar. 24, 2020
Filed:
Mar. 06, 2019
Namie Suzuki, Shizuoka, JP;
Kazumi Suzuki, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Yoshitaka Yamauchi, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Akihiro Kaneko, Shizuoka, JP;
Namie Suzuki, Shizuoka, JP;
Kazumi Suzuki, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Yoshitaka Yamauchi, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Akihiro Kaneko, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner is provided. The toner comprises mother particles and an external additive covering the mother particles. The mother particles comprise a binder resin, and the external additive comprises inorganic particles. The inorganic particles comprise small-size inorganic particles having an equivalent circle diameter of from 30 to 70 nm and large-size inorganic particles having an equivalent circle diameter of from 150 to 200 nm and a circularity of 0.85 or more. The large-size inorganic particles are 20 to 70 in number per 100 μmimage area of the toner observed with a field-emission scanning electron microscope.