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:
Jul. 14, 2020
Filed:
Jan. 28, 2019
Minoru Masuda, Shizuoka, JP;
Atsushi Yamamoto, Tokyo, JP;
Taichi Nemoto, Shizuoka, JP;
Junichi Watanabe, Shizuoka, JP;
Taro Araki, Shizuoka, JP;
Takeshi Shibuya, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Atsushi Yamamoto, Tokyo, JP;
Taichi Nemoto, Shizuoka, JP;
Junichi Watanabe, Shizuoka, JP;
Taro Araki, Shizuoka, JP;
Takeshi Shibuya, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner is provided that contains a crystalline polyester resin comprising a polycondensed resin of a dicarboxylic acid represented by the following formula (1) with a diol represented by the following formula (2). A content of a cyclic ester represented by the following formula (3) in the toner, measured by a thermal extraction gas chromatographic mass spectrometry at a thermal extraction temperature of 160° C., is from 1 to 200 ppm in terms of toluene: where n represents an integer of from 2 to 12; where m represents an integer of from 2 to 12; and where n represents an integer of from 2 to 12, m represents an integer of from 2 to 12, and m+n≥6 is satisfied.