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. 14, 2015
Filed:
Mar. 08, 2013
Syouko Satoh, Miyagi, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Satoshi Kojima, Shizuoka, JP;
Osamu Uchinokura, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Daisuke Ito, Kanagawa, JP;
Satoshi Ogawa, Nara, JP;
Kiwako Hirohara, Miyagi, JP;
Takahiro Honda, Shizuoka, JP;
Daisuke Inoue, Shizuoka, JP;
Syouko Satoh, Miyagi, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Satoshi Kojima, Shizuoka, JP;
Osamu Uchinokura, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Daisuke Ito, Kanagawa, JP;
Satoshi Ogawa, Nara, JP;
Kiwako Hirohara, Miyagi, JP;
Takahiro Honda, Shizuoka, JP;
Daisuke Inoue, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner including: toner base particles; and an external additive, the toner base particles each comprising a binder resin and a colorant, wherein the external additive comprises non-spherical particles and spherical particles, wherein the non-spherical particles are each a secondary particle in which spherical primary particles are coalesced together, and wherein the non-spherical particles and the spherical particles in the external additive satisfy a relationship expressed by the following formula (1):3(%)<(%)  Formula (1) where Ca is greater than 10% but smaller than 20% and Cb is greater than 40% but smaller than 70%, and Ca and Cb are values given by: