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:
May. 27, 2003
Filed:
Jul. 27, 2001
Koji Inaba, Odawara, JP;
Hiroaki Kawakami, Yokohama, JP;
Tatsuya Nakamura, Mishima, JP;
Shinya Yachi, Mishima, JP;
Yuji Moriki, Numazu, JP;
Satoshi Handa, Suntoh-gun, JP;
Katsuyuki Nonaka, Mishima, JP;
Yoshihiro Nakagawa, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner having a good chargeability stable against an environmental change is formed of toner particles each comprising at least a binder resin, a colorant, a release agent and a sulfur-containing polymer, and an external additive. The toner particles contain 100 to 30,000 ppm by weight thereof of at least one stabilizer element selected from the group consisting of magnesium, calcium, barium, zinc, aluminum and phosphorus. The toner particles may preferably be produced by suspension polymerization of a monomer composition containing the sulfur-containing polymer in an aqueous medium containing a dispersion stabilizer having the stabilizer element.