Appeal No. 1997-0195
Application 08/126,987
sensitized silver halide emulsion layer; (2) chlorinated s-triazine hardeners; (3) chemical
compounds containing cyano groups; and (4) a divalent or tetravalent palladium salt in a
silver halide emulsion layer and/or an adjacent layer thereto. The palladium salt
scavenges HCN gas released by the element.
2. Harbison discloses a photographic assemblage comprising a light-sensitive
photographic element that comprises a support bearing a silver halide emulsion layer and
an associated non-light sensitive material comprising a support containing carbon black.
Column 2, lines 6-11. The silver halide emulsion layer can comprise gold and sulfur
sensitized silver halide emulsions. Column 4, lines 20-23. The assemblage further
comprises a noble metal scavenger for HCN gas evolving from carbon black in the
associated material. Column 2, lines 12-18. The scavenger includes divalent and
tetravalent palladium salts. Column 2, lines 40-42, and 45-46.
3. According to Harbison, it is critical that the scavenger be located in the
assemblage where it intercepts HCN gas evolving from carbon black before the gas
reaches the silver halide in the light-sensitive element. Column 2, lines 12-16; and column
3, lines 3-7; and claim 1. Harbison teaches that the scavenger should not have a
deleterious effect on silver halide or “should be incorporated in such a manner that it does
not come into contact with the silver halide layers” (emphasis added). Column 2, lines 26-
29. The scavenger can be located in the layer containing carbon black, a layer coated
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