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:
Oct. 17, 2017
Filed:
Feb. 24, 2016
Junichi Watanabe, Shizuoka, JP;
Kenji Yoneda, Shizuoka, JP;
Kohsuke Satoh, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Keiji Makabe, Shizuoka, JP;
Daichi Hisakuni, Shizuoka, JP;
Junichi Watanabe, Shizuoka, JP;
Kenji Yoneda, Shizuoka, JP;
Kohsuke Satoh, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Keiji Makabe, Shizuoka, JP;
Daichi Hisakuni, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner includes a base particle comprising a crystalline polyester resin; and an external additive which is a group of silica particles having a number-average particle diameter of from 0.01 μm to 0.11 μm on the surface of the toner. A number ratio of the silica particles having a circularity not less than 0.8 is 20% or more in the total number of the silica particles.