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:
Jun. 29, 2010
Filed:
Sep. 11, 2008
Hidenori Satoh, Odawara, JP;
Kenichi Yamauchi, Susono, JP;
Genya Anan, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing roller is provided which is soft enough to enable toners to be kept from deteriorating with time and cannot easily cause permanent set. The developing roller includes a mandrel, an elastic-material layer and a cover layer as a surface layer which covers the elastic-material layer. Asker-C hardness at the surface of the cover layer is from 40° to 85°. The cover layer has a thickness of from 15 nm to 5,000 nm. Martens hardness H1 (N/mm) at the surface of the developing roller, Martens hardness H2 (N/mm) of the elastic-material layer and the thickness d (mm) of the cover layer satisfy the relationship of the following expression (1):400≦(1−2)/≦2,000  (1).