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:
Sep. 04, 2001
Filed:
Dec. 14, 1999
Akio Onuki, Ibaraki, JP;
Saburo Sonobe, Toride, JP;
Sadayuki Ishikura, Ibaraki, JP;
Satoru Tani, Ibaraki, JP;
Kinoyosha Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a conductive rubber roller, comprising a core metal shaft, an ionic conductive layer formed to surround the outer circumferential surface of the core metal shaft and consisting of a high molecular weight elastomer containing an ionic conducting agent or a foamed body of such a high molecular weight elastomer, an electron conductive layer formed to surround the outer circumferential surface of the ionic conductive layer and consisting of a high molecular weight cellular elastomer containing an electron conducting agent or a high molecular weight cellular elastomer containing an electron conducting agent, a toner contamination preventing layer formed to surround the outer circumferential surface of the electron conductive layer, and an insulating annular sealing member mounted to each of both edges of the ionic conductive layer and the electron conductive layer both extending in the longitudinal direction of the metal core wherein a relationship R,>R,>R,, where R,, R,and R,denote, respectively, the electric resistance of the ionic conductive layer, the electron conductive layer and the toner contamination preventing layer, is satisfied, and the annular sealing member has an electric resistance of at least 10,&OHgr;·cm.