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. 04, 2009
Filed:
Apr. 02, 2008
Takashi Kusaba, Suntou-gun, JP;
Ryota Kashiwabara, Susono, JP;
Minoru Nakamura, Suntou-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing roller having an elastic layer on the outer periphery of a mandrel and having a surface layer containing a resin and resin particles on its outer periphery, wherein the surface layer has a convex portion attributable to the resin particles, and has a surface of roughness in which a distortion degree Rsk of a roughness curve is 0.15 or more and 0.70 or less, wherein the resin particles have a peak Pat a particle diameter din a volume particle size distribution, and wherein 'a', 'b', “c”, d, dand dsatisfy a specific relationship, where, “a” denotes a volume fraction of the resin particle having the particle diameter din the volume particle size distribution, and “b” and “c” denote volume fractions at particle diameters dand drespectively in the volume particle size distribution.