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. 30, 2002
Filed:
Oct. 30, 2000
Tsutomu Onuma, Yokohama, JP;
Hirohide Tanikawa, Shizuoka-ken, JP;
Nobuyuki Okubo, Yokohama, JP;
Yoshihiro Ogawa, Shizuoka-ken, JP;
Tsuneo Nakanishi, Mishima, JP;
Katsuhisa Yamazaki, Numazu, JP;
Kaori Hiratsuka, Shizuoka-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner having a stable chargeability in various environments, a stable fixability over a wide temperature range and a resistance to sticking on an image-bearing member, is formed of a binder resin, a colorant and an azo iron compound as a charge control agent. The azo iron compound is formed from a monoazo compound having at least one alkyl group and two hydroxyl groups capable of bonding with an iron atom. The toner has a tetrahydrofuran-soluble content providing a gel-permeation chromatogram showing at least one peak in a molecular weight region of 3×10 to 5×10 and at least one peak or shoulder in a molecular weight region of above 5×10 and at most 1×10 .