Appeal No. 2007-0218
Application No. 10/730,143
Claim 1 also requires that the product include a reducing agent
comprising a compound represented by formula (R-1) and a compound
represented by either formula (R-2) or (R-3). We agree with the Examiner
that the cited references would have made this limitation obvious as well.
Toya 126 teaches that the exemplary reducing agents include
bisphenols (col. 21, l. 55, to col. 22, l. 25). Suzuki also describes reducing
agents for an organic silver salt in the presence of silver halide (col. 10, ll.
53-56), states that “reducing agents may be used as combinations of two or
more” (col. 16, ll. 35-36), and states that the “most preferred reducing agents
are 2,4-dialkyl substituted orthobisphenols, 2,6-dialkyl substituted
parabisphenols or mixtures thereof” (col. 15, ll. 35-38). Suzuki states that
reducing agents such as 2,4-dialkyl orthobisphenols are “effective for
preventing discoloration upon exposure to light” (col. 16, ll. 53-58). Based
on Suzuki, we agree with the Examiner that it would have been obvious to
include two 2,4-dialkyl substituted orthobisphenols as reducing agents in the
composition of Toya 126.
Yoshioka describes a photothermographic material comprising a
photosensitive silver halide, a non-photosensitive organic silver salt, a
reducing agent, and a binder, “wherein it contains one or more phenol
compounds as the reducing agent” (¶ 0008). Yoshioka teaches that the
phenol compound “is preferably an o-polyphenol compound, in particular, a
compound represented by the following formula (I):
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