Azo dyes, azo dye-releasing compounds and photographic products and processes employing them
Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a novel releasable azo dye. The dyes are azophenols, or precursors of azophenols, and have an electron withdrawing group in one of the positions ortho to the phenolic hydroxy group and a carbamoyl electron withdrawing group in the other position ortho to the phenolic hydroxy group.
Description
Patent History
Patent number: T994003
Type: Grant
Filed: Sep 21, 1979
Date of Patent: May 6, 1980
Inventor: Kenneth N. Kilminster (London)
Application Number: 6/77,876
Type: Grant
Filed: Sep 21, 1979
Date of Patent: May 6, 1980
Inventor: Kenneth N. Kilminster (London)
Application Number: 6/77,876
Classifications
Current U.S. Class:
Redox Cleavable Dye Or Dye Precursor Releaser (430/242);
And Dye (430/390);
Monoazo (430/562);
260/202
International Classification: G03C 554;
International Classification: G03C 554;
