Fogged, direct-positive silver halide emulsion optically sensiti

Details Fogged, direct-positive silver halide emulsion optically sensiti Fogged, direct-positive silver halide emulsion optically sensiti

1974-04-24

1976-03-02

Louie, Jr., Won H.

Gas separation: apparatus

Chromatography type apparatus

96107, 96108, 96130, 260240E, G03C 102, G03C 136

Patent

active

039416020

ABSTRACT:
A direct-positive photographic element is described which comprises a support and a spectrally-sensitized light-sensitive silver halide emulsion layer containing fogged silver halide grains wherein the said emulsion is spectrally sensitized by means of a dye containing a pyrrolo[ 2,1-b]thiazole nucleus which may be substituted and carry one or more fused-on rings, the said nucleus being linked by the 5- or 7-carbon atom thereof, directly or through a dimethine chain to another nitrogen containing heterocycle.

REFERENCES:
patent: 3772278 (1973-11-01), Jeffreys et al.
patent: 3809691 (1974-05-01), Carpenter et al.

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