Direct-positive silver halide emulsions having incorporated deve

Details Direct-positive silver halide emulsions having incorporated deve Direct-positive silver halide emulsions having incorporated deve

1975-02-21

1977-05-31

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Ionizing electrode details

96 64, G03C 106, G03C 524

Patent

active

040267083

ABSTRACT:
Direct-positive emulsions are described comprising incorporated developing agents wherein the developing agents are 1,4-dihydroxybenzene compounds of which at least one of the hydroxyl groups has been esterified to form a hydrolyzable aliphatic acyloxy group comprising a quaternary ammonium group.

REFERENCES:
patent: 3519428 (1970-07-01), Ishikawa et al.
patent: 3632340 (1972-01-01), Illingsworth
patent: 3650749 (1972-03-01), Willems et al.

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