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:
Jan. 31, 2017
Filed:
Feb. 24, 2015
Ryuta Chiba, Kanagawa, JP;
Shinya Nakayama, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Akinori Saitoh, Shizuoka, JP;
Hideyuki Santo, Kanagawa, JP;
Shinsuke Nagai, Shizuoka, JP;
Akihiro Takeyama, Kanagawa, JP;
Hiroyuki Takeda, Kanagawa, JP;
Tsuyoshi Sugimoto, Shizuoka, JP;
Suzuka Amemori, Shizuoka, JP;
Kohsuke Nagata, Shizuoka, JP;
Ryuta Chiba, Kanagawa, JP;
Shinya Nakayama, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Akinori Saitoh, Shizuoka, JP;
Hideyuki Santo, Kanagawa, JP;
Shinsuke Nagai, Shizuoka, JP;
Akihiro Takeyama, Kanagawa, JP;
Hiroyuki Takeda, Kanagawa, JP;
Tsuyoshi Sugimoto, Shizuoka, JP;
Suzuka Amemori, Shizuoka, JP;
Kohsuke Nagata, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.