Appeal No. 95-0015
Application No. 07/869,694
pressure sensitivity and reduced reciprocity failure without
having significantly decreased speed (col. 2, lines 13-21).
Johnson’s preferred silver halide grains are tabular silver
bromoiodide grains (col. 2, lines 25-26; col. 2, line 67 - col.
3, line 2).
Mihara teaches that “[t]he compounds represented by formula
(IIa) or formula (IIb) may be added to the emulsion before or
after the addition of the sensitizing dyes” (col. 24, lines 21-
23) and that the sensitizing dyes can be “dispersed at any stage
during the preparation of the silver halide emulsion” (col. 23,
lines 59-65). Hirabayashi teaches that substituted 1-phenyl-5-
mercaptotetrazole compounds are effective antifoggants (col. 5,
lies 57-63; col. 9, lines 18-19) and can be added at any time
from before forming the silver halide grains to after completing
the chemical ripening but before coating (col. 8, lines 47-58).
Mihara and Hirabayashi do not specifically disclose adding the
compounds represented by formulas (IIa) and (IIb) and a
mercaptobenzotetrazole prior to heating. The reference relied
upon by the examiner as providing a motivation to do so is James.
This reference teaches that heat treatment usually is needed when
a silver halide photographic emulsion is chemically sensitized,
4
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007