Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Electrophotographic photoconductor
 An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer may be made of a charge generation layer containing a charge generating material and a charge transport layer containing a charge transporting material formed thereon, with a protective layer containing a charge transporting material optionally provided on top of the photoconductive layer, with any of the photoconductive layer, the charge transport layer or the protective layer, which constitutes a surface top layer of the photoconductor, having an oxygen transmission coefficient of 4.0.times.10.sup.-11 cm.sup.3 .cndot.cm/cm.sup.2 .cndot.s.cndot.cmHg or less, and the charge transporting material for use in the surface top layer having a charge mobility of 1.times.10.sup.-5 cm.sup.2 /V.cndot.s or more at an electric field strength of 5.times.10.sup.5 V/cm. 
Ricoh Company, Ltd.
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Yasuo
Suzuki