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:
Apr. 20, 1993
Filed:
Mar. 16, 1990
Fuminori Ishikawa, Hitachiohta, JP;
Kunihiro Tamahashi, Mito, JP;
Shigeharu Onuma, Hitachi, JP;
Masatoshi Wakagi, Hitachi, JP;
Masanobu Hanazono, Mito, JP;
Mitsuyoshi Shoji, Ibaraki, JP;
Takayuki Nakakawaji, Hitachi, JP;
Yutaka Ito, Takahagi, JP;
Shigeki Komatsuzaki, Mito, JP;
Chiaki Yamabishi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Abstract
An electrophotographic photosensitive element, e.g. for a photocopier or laser printer, comprises a substrate and a plurality of layers on the substrate including a photoconductive layer of a-Si:H and a protective and lubricating layer which is outermost from said substrate. To provide wear resistance and long life-time of the protective and lubricating layer, this layer comprises a microporous solid material having a pore structure which extends substantially over the whole thickness of the material and a hydrophobic lubricant carried by said solid material. The lubricant includes a liquid film and often times a non-particulate solid film, and provides at least part of the outer surface of the element and is present also in the pores of said microporous solid material.