Appeal No. 2007-0218
Application No. 10/730,143
R-3” and that Yoshioka discloses specific compounds within formulas R-1,
R-2, and R-3. (Id. at 8-9.) The Examiner concludes that the cited references
would have made the product of claim 1 obvious to a person of ordinary
skill in the art.
We conclude that the Examiner has set forth a prima facie case of
obviousness. In particular, Toya 126 describes a photothermographic
material comprising a photosensitive silver halide, an organic silver salt, a
reducing agent for the organic silver salt, and a binder on a surface of a
support (col. 1, ll. 38-40; col. 18, ll. 1-24; col. 21, ll. 41-47; col. 24, l. 61).
Toya 126 states that the silver halide can be silver iodide or silver
iodobromide (col. 16, ll. 50-53), thus teaching embodiments in which all or
only a portion of the silver halide is silver iodide. In addition, Toya 126
teaches that silver iodobromide having a silver iodide content of 0.1 to 40
mole % is most preferred (col. 16, ll. 55-56). This preferred range overlaps
the range recited in claim 1 at 40 mole %.
Siga describes an image forming material comprising a silver halide
including silver iodide, an organic silver salt, a reducing agent, and a binder
(col. 3, l. 60 to col. 4, l. 5). Siga states that this composition provides
improved stability and sensitivity (col. 4, ll. 46-49). Siga also states that,
“for the silver iodide to exert a sufficient effect,” it is preferably included in
an amount of at least 30 mole %, more preferably at least 50 mole %, based
on the silver halide component (col. 6, ll. 43-50). Based on the teachings in
Toya 126 and Siga, we agree with the Examiner that it would have been
obvious to include, in the composition of Toya 126, silver iodide in an
amount of at least 40 mole %, as recited in claim 1.
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