Appeal No. 1996-1581
Application No. 08/149,815
1. A charging roll comprising:
a center shaft;
a foam layer formed on an outer circumferential surface of said center
shaft, said foam layer consisting of an electrically conductive foam
body or a foam body a part of which is made electrically conductive;
an electrically conductive elastic layer formed on an outer surface of
said foam layer, said electrically conductive elastic layer having a
thickness of 10OFm-1200Fm, and comprising one of an electrically
conductive rubber composition and an electrically conductive
thermoplastic elastomer;
a resistance adjusting layer formed by coating on an outer surface of
said electrically conductive elastic layer; and
a protective layer formed by coating on an outer surface of said
resistance adjusting layer.
The examiner relies upon the following references as evidence of obviousness:
Hosaka et al. (Hosaka) 5,168,313 Dec. 01, 1992
Ohta et al. (Ohta) 5,312,662 May 17, 1994
Appellants' claimed invention is directed to a charging roll that finds utility in
electrophotographic copying machines and the like. The charging roll comprises an
electrically conductive elastic layer formed on the outer surface of an electrically conductive
foam layer, a resistance adjusting layer formed on the outer surface of the elastic layer and
a protective layer. The elastic layer is made up of either a rubber
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