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. 25, 2003
Filed:
Jul. 26, 2001
Yuichi Mizoo, Ibaraki, JP;
Takeshi Naka, Shizuoka, JP;
Masami Azuma, Ibaraki, JP;
Takashige Kasuya, Shizuoka, JP;
Tadashi Dojo, Shizuoka, JP;
Tsuneo Nakanishi, Chiba, JP;
Nene Shibayama, Shizuoka, JP;
Katsuhisa Yamazaki, Shizuoka, JP;
Yusuke Hasegawa, Ibaraki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner has toner particles containing at least a binder resin, a colorant and a sulfur-containing compound selected from the group consisting of a sulfur-containing polymer and a sulfur-containing copolymer. The toner has a weight-average particle diameter of from 5 &mgr;m to 12 &mgr;m, and the toner has, in its particles of 3 &mgr;m or larger in diameter, at least 90% by number of particles with a circularity of 0.900 or higher, and has a specific relationship between the cut rate Z and the toner weight-average particle diameter X and a specific relationship between the number-based cumulative value Y of particles with a circularity of 0.950 or higher and the toner weight-average particle diameter X. Also disclosed are an image-forming method and a process cartridge which make use of the toner.