Pyrazolotriazle dye-forming photographic coupler
AssigneeEastman Kodak Company
InventorsPing-Wah Tang, Stanley W. Cowan
Life of this patent
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AssigneeEastman Kodak Company
InventorsPing-Wah Tang, Stanley W. Cowan
Estimating the term…
A color photographic film or paper comprises at least one silver halide emulsion layer having associated therewith a dye-forming coupler compound of the formula ##STR1## wherein: one of Z.sub.a and Z.sub.b is --N=and the other is ##STR2## to which ring "A" is directly attached; R.sup.0 represents hydrogen or a substituent; R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represent hydrogen or substituents, provided that any two R.sup.1 groups, any two R.sup.4 groups or R.sup.2 and R.sup.3 may form a ring; L represents a divalent linking group; B represents a substituted or unsubstituted sulfonamido or sulfamoyl group; D represents a substituted or unsubstituted alkyl, aryl carbocyclic or heterocyclic group; X represents hydrogen or a coupling-off group; p and m represent integers from 0 to 4; and n represents 0 or 1.
A photographic element comprising a support bearing at least one photographic silver halide emulsion layer having associated therewith a dye-forming coupler of the formula:
Dependencies are inferred from the claim text.