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:
Feb. 08, 2005
Filed:
Mar. 11, 2003
Akihiro Sugino, Numazu, JP;
Ryohichi Kitajima, Numazu, JP;
Yoshiaki Kawasaki, Susono, JP;
Takaaki Ikegami, Susono, JP;
Eiji Kurimoto, Numazu, JP;
Akihiro Sugino, Numazu, JP;
Ryohichi Kitajima, Numazu, JP;
Yoshiaki Kawasaki, Susono, JP;
Takaaki Ikegami, Susono, JP;
Eiji Kurimoto, Numazu, JP;
Ricoh Company Ltd., Tokyo, JP;
Abstract
An electrophotographic photoreceptor includes an electroconductive substrate. A charge generation layer overlies the electroconductive substrate. A first charge transport layer overlying the charge generation layer includes a first charge transport material (D) and a first binder resin (R). A second charge transport layer overlying the first charge transport layer includes a filler, a second charge transport material (D) and a second binder resin (R). The first and second charge transport layers have a total thickness of from 5 to 25 μm. A weight ratio (D/R) of the first charge transport material (D) to the first binder resin (R) in the first charge transport layer is greater than a weight ratio (D/R) of the second charge transport material (D) to the second binder resin (R) in the second charge transport layer.