Color photographic materials containing diffusion fast pyrazolon

Details Color photographic materials containing diffusion fast pyrazolon Color photographic materials containing diffusion fast pyrazolon

1974-05-14

1976-08-10

Brown, J. Travis

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96 56, 96 565, 260310R, G03C 140

Patent

active

039739791

ABSTRACT:
Improved 5-pyrazolone couplers of the following formula ##SPC1## wherein R,R.sub.1 R.sub.2,X and A denotes as described hereinafter for use in lightsensitive color photographic materials which are easy to prepare and give rise after chromogenic development to magenta dyes with improved stability to light.

REFERENCES:
patent: 3700454 (1972-10-01), Sakamoto et al.
patent: 3761274 (1973-09-01), Inoue et al.
patent: 3785828 (1974-01-01), Iwama et al.

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