Silver halide emulsion containing colored magenta coupler for ph

Details Silver halide emulsion containing colored magenta coupler for ph Silver halide emulsion containing colored magenta coupler for ph

1974-03-27

1978-01-24

Brown, Travis

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96 9, 96 565, G03C 140

Patent

active

040701913

ABSTRACT:
A coloured magenta coupler for photography is disclosed which is represented by the following general formula: ##STR1## wherein R is substituted phenyl, R.sub.1 and R.sub.2 individually stand for hydrogen, halogen, hydroxyl, alkyl, alkoxy or acylamino, with the proviso that one of R.sub.1 and R.sub.2 is hydroxyl but that both are not hydroxyl simultaneously, R.sub.3 is hydrogen, halogen, alkyl, nitro or acylamino and R.sub.4 stands for hydrogen, halogen or a monovalent organic residue.

REFERENCES:
patent: 3476564 (1969-11-01), Mariani et al.
patent: 3576635 (1971-04-01), Sakamoto et al.
patent: 3671257 (1972-06-01), Otto et al.
patent: 3790379 (1974-02-01), Oishi et al.

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