Appeal No. 94-3359
Application 07/941,566
44). Minsk resolves the aforementioned problems by providing
suitable, non-diffusing reducing agents (developers) in silver
halide emulsion layers containing color couplers. The developers
are non-diffusing, polymeric compounds having recurring units
containing two or more hydroxyl units (column 1, line 69 through
column 3, line 66). The non-diffusing stain or fog inhibitors
may be incorporated directly in gelatin emulsions (column 5,
lines 64 through 71).
IBM discloses photosensitive compositions containing
silver halide and gelatin (page 1, lines 14 through 18). The
photosensitive compositions also contain a thermoplastic novolak
polymer prepared by reaction of formaldehyde and a phenolic
monomeric silver halide developing agent (page 2, lines 9 through
18). A preferred novolak is prepared from formaldehyde and p-
dihydroxybenzene (hydroquinone). Preferred novolaks have a
molecular weight of from 300 to 600 although greater or lesser
molecular weights may be useful (page 2, line 53 through 57).
When added to silver halide emulsions, the novolak was found to
impart both the properties of a non-diffusing developer and an
image strengthener (page 2, lines 58 through 61).
Appellants' broadest claim, claim 1, is directed to a
"black and white" photographic element comprising as the
photosensitive medium a silver halide emulsion layer having in
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