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. 21, 2002
Filed:
Apr. 13, 1999
Naoki Okamoto, Numazu, JP;
Yasuhide Goseki, Yokohama, JP;
Masayoshi Shimamura, Yokohama, JP;
Kenji Fujishima, Yokohama, JP;
Kazunori Saiki, Yokohama, JP;
Satoshi Otake, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus has a developer container for holding a developer, a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone and a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member. The developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate. The resin composition contains at least (I) a binder resin, (II) a conductive fine powder, (III) spherical particles having a number-average particle diameter of from 0.3 &mgr;m to 30 &mgr;m and (IV) a quaternary ammonium salt compound which is positively chargeable to iron powder.