Daniel J Corcoran

US Patent:

55761500, Nov 19, 1996

Filed:

Feb 29, 1996

Appl. No.:

8/608884

Inventors:

Ping W. Tang - Rochester NY
Stanley W. Cowan - Rochester NY
David J. Decker - Rochester NY
Daniel E. Corcoran - Webster NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 738

US Classification:

430386

Abstract:

The invention provides a photographic light sensitive silver halide emulsion layer having associated therewith a pyrazolotriazole dye-forming coupler having formula: ##STR1## wherein: R. sub. 1 is a substituent bonded to the pyrazolotriazole nucleus by a fully substituted carbon atom; X is hydrogen or a coupling-off group; R. sub. 2, R. sub. 3, R. sub. 4, and R. sub. 6 are independently hydrogen or substituent groups; q is from 1 to 3; R. sub. 5 and R. sub. 7 are independently alkyl, alkoxy, aryl, or aryloxy groups; G is a substituent group and n is from 0 to 3; and Y is a substituent group and m is 0 to 4. The invention also provides a coupler compound, a photographic element containing the emulsion layer of the invention, and an imaging process.

US Patent:

61300322, Oct 10, 2000

Filed:

Sep 26, 1997

Appl. No.:

8/938719

Inventors:

Ping W. Tang - Rochester NY
James H. Reynolds - Rochester NY
Daniel E. Corcoran - Webster NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 730

US Classification:

430557

Abstract:

A photographic element exhibiting improved yellow dye stability comprises a light sensitive silver halide emulsion layer having associated therewith a yellow dye forming coupler having the formula: wherein: R. sup. 1 and R. sup. 2 in the formula are independently selected alkyl, aryl, amino or heterocyclic groups, each free of hydrogen bonded to the atom linking the group to the rest of the coupler; R. sup. 3 is a H or a substituent; X is C, S, or P, and n is 1 or 2; each Z is an independently selected substituent group substitutable to a phenyl ring provided that at least one such group is an electron withdrawing group and s is 1 to 3; each Y is an independently selected substituent group and r is 1 to 3.