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. 11, 1998
Filed:
Aug. 15, 1996
Applicant:
Inventors:
Junji Kurokawa, Yokohama, JP;
Takeshi Tabuchi, Kawaguchi, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ; B32B / ;
U.S. Cl.
CPC ...
428 369 ; 399176 ; 492 53 ; 492 56 ;
Abstract
An electrostatic charging roller having at least two layers; namely an elastic layer and a surface layer covering a surface of the elastic layer; wherein the surface layer contains low structure acetylene with a particle diameter of 44 to 60 m.mu. to improve uniformity in electrification by the electrostatic charging roller having a surface layer in which conductive particles and non-adhesive resin are dispersed therein. Also dependency of the electrostatic charging roller on humidity is suppressed to a lower level, which makes smaller fluctuation of the electrifying characteristics caused by changes in environmental conditions.