Appeal No. 95-3947
Application 07/812,530
polymeric binder, than the bottom layer (col. 1, lines 46-67; col. 2, lines 3-26). The concentration
of charge transport material in the bottom layer can be up to 80%, preferably 30-80% (col. 2,
lines 26-28). The top layer is relatively lean in charge transport material, and need contain none at
all (col. 1, lines 65-67; col. 2, lines 28-29). In an example, the bottom layer is about three times
as thick as the top layer (col. 2, lines 42-44).
Yanus ‘687 teaches that when a charge transport layer comprised of activating small
molecules such as arylamines in a polymeric binder is used with liquid development systems,
leaching out the activating small molecules results in crystallization of the activating small
molecules and increases the susceptibility of the transport layer to solvent/stress cracking during
periods of nonuse (col. 2, lines 22-52). The Yanus ‘687 invention is a photographic imaging
member which has greater resistance to component leaching, cracking, crazing, softening,
swelling and abrasion, and which comprises a substrate, a charge blocking layer, a charge
generating layer and a charge transport layer, wherein at least the charge generating layer or
charge transport layer includes a polymeric arylamine compound selected from a specified genus
(col. 5, line 1 - col. 10, line 65). Appellants state that their polymeric arylamine compound
preferably is a compound as disclosed in a number of U.S. patents, one of which is Yanus ‘687
(specification, page 12, lines 7-12). Yanus ‘687 does not disclose use of a charge transport dual
layer as recited in appellants’ claims.
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Last modified: November 3, 2007