Direct positive silver halide emulsion

Details Direct positive silver halide emulsion Direct positive silver halide emulsion

1978-10-17

1981-03-31

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430581, 430596, 430597, 430604, 430605, 430599, 542434, 542435, 542467, G03C 108, G03C 136

Patent

active

042594391

ABSTRACT:
A high-contrast direct positive prefogged silver halide emulsion free from coror stain, which contains at least one new dimethinecyanine dye wherein the 3-position of a pyrazolo[1,5-a]pyridine nucleus is bonded through a dimethine chain to the 1-, 2-, 3- or 4-position of a cyanine hetero ring nucleus, provided that where the bonding is in the 4-position said cyanine nucleus is a quinoline nucleus or a pyridine nucleus and where the bonding is in the 1- or 3-position said cyanine nucleus is an isoquinoline nucleus, said dimethyinecyanine dye being present in an amount sufficient to sensitize said emulsion.

REFERENCES:
patent: 3615639 (1971-10-01), Carpenter et al.
patent: 3925085 (1975-12-01), Sato et al.

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