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:
May. 17, 2001
Hidenori Satoh, Tokyo, JP;
Noriyuki Yanai, Kanagawa, JP;
Kentaro Niwano, Kanagawa, JP;
Arihiro Yamamoto, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing roller having a superior setting ability and having a uniform and high conductivity is provided by improving dispersion and stability of carbon black mixed in a solution of a coating resin, and then forming a resin layer that has a low modulus of elasticity and a high conductivity when coated. The developing roller includes a core shaft, an elastic body layer formed around the core shaft and made of rubber as a main ingredient, and a resin layer coated at least on an outer surface of the elastic body layer. The resin layer contains carbon black having a DBP absorption amount of 80 to 110 ml/100 g, a ratio of a DBP absorption amount to a nitrogen specific surface area being not more than 0.012 ml/m , and a ratio of a volatile component to a nitrogen specific surface area being not more than 2.0×10 g/m .