Appeal No. 2003-1774
Application No. 09/797,038
“the reduction of light fatigue appears to involve a specific
chemical process that depends on the chemical composition (as
distinct from the color value) of the material” (page 24 of
answer).
Concerning the § 103 rejection of claims 1-7 over Anderson
as the primary reference, we concur with the examiner that, based
the collective teachings of the applied prior art, it would have
been obvious prima facie obvious for one of ordinary skill in the
art to employ the claimed reaction product of p-cresol and
dicyclopentadiene as an antioxidant in the charge transport layer
of Anderson with the reasonable expectation that the
photoconductor would have improved durability against active
gases, such as ozone, as well as have enhanced repetition
characteristics. We agree with the examiner that Mori provides a
generic teaching of using a hindered phenol antioxidant and,
since Williams and Cottman disclose that the presently claimed
hindered phenol antioxidant is useful for preventing the
deleterious effects of oxygen and ozone, one of ordinary skill
in the art would have found it obvious to select the claimed
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