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. 23, 2015
Filed:
Oct. 22, 2013
Hirofumi Yamanami, Shizuoka, JP;
Koji Enomoto, Kanagawa, JP;
Naoyuki Esaki, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
Provided is an electrophotographic photoconductor including an electroconductive substrate, a photoconductive layer on the electroconductive substrate, and a protection layer on the photoconductive layer, wherein the protection layer contains two or more metal oxides having different average primary particle diameters, a binder resin, and a charge transporting material, the content of the metal oxides in the protection layer is 50% by mass or higher, and the average primary particle diameters of the metal oxides satisfy all of formula (I) to (III) below:(1)<(2)  formula (I);(1)/(2)≦0.25  formula (II); and0.1 μm≦(2)  formula (III)