Appeal No. 95-0015
Application No. 07/869,694
specified benzothiazolium salt or hydrolyzed benzothiazolium salt
and a specified mercaptobenzotetrazole and then heating to
complete the chemical sensitizing.
Mihara discloses a method for spectrally sensitizing silver
halide grains by including in an emulsion containing the grains
at least one specified sensitizing dye in combination with at
least one compound represented by Mihara’s formula (IIa) or (IIb)
(col. 1, line 8-14; col. 2, line 65 - col. 4, line 30). When Y
in Mihara’s formulas (IIa) and (IIb) is sulfur, these formulas
can represent compounds which are represented by, respectively,
formulas (B) and (A) in appellant’s claim 1. Mihara teaches that
known antifoggants including 1-phenyl-5-mercaptotetrazole, which
is among the mercaptobenzotetrazoles encompassed by formula (C)
in appellant’s claim 1, can be added to the emulsion (col. 29,
lines 43-52).
Mihara indicates that silver halides generally, including
silver iodobromide and silver bromide, can be used in the method
(col. 28, lines 14-23), but does not disclose use of tabular
silver bromoiodide or silver bromide grains doped with selenium
or iridium. To remedy this deficiency, the examiner relies upon
Johnson, which teaches that silver halide emulsions doped with
iridium and selenium during crystal growth exhibit reduced
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