Organic heterocyclic and thioaryl phosphines in silver halide em

Details Organic heterocyclic and thioaryl phosphines in silver halide em Organic heterocyclic and thioaryl phosphines in silver halide em

1975-07-01

1977-01-18

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 66R, 96 665, 96 76R, 96 67, 96 95, 96107, 96109, G03C 524, G03C 134, G03C 106

Patent

active

040037460

ABSTRACT:
Photographic elements comprising a silver halide emulsion layer give less fog in negative type emulsions and increased speed in direct-positive emulsions when said emulsions are developed in the presence of an organic heterocyclic or thioaryl-substituted tertiary phosphine.

REFERENCES:
patent: 3297446 (1967-01-01), Dunn
patent: 3578449 (1971-05-01), Bloom
patent: 3640713 (1972-02-01), Buckler et al.
patent: 3644530 (1972-02-01), Bloom
patent: 3785822 (1974-01-01), Overman
patent: 3895951 (1975-07-01), Riester

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