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:
Aug. 03, 2004
Filed:
Feb. 20, 2003
Applicant:
Inventors:
Assignee:
Canon Kasei Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 1/502 ;
U.S. Cl.
CPC ...
G03G 1/502 ;
Abstract
In a charging roller having a support member and a conductive cover layer, the conductive cover layer is formed of a seamless tube. The seamless tube contains at least (A) a thermoplastic styrene elastomer, (B) a polystyrene resin and (C) a carbon black, and the proportion of the component (A) to the component (B) is (A)/(B)=60/40 to 20/80 in weight ratio. A process cartridge and an electrophotographic apparatus have such a charging roller.