Silver halide photographic elements with increased contrast

Details Silver halide photographic elements with increased contrast Silver halide photographic elements with increased contrast

1993-09-30

1995-07-04

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430600, 430611, 430613, 430614, G03C 1005, G03C 106

Patent

active

054299195

ABSTRACT:
A silver halide photographic element comprising a silver halide emulsion in reactive association with a compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently an aryl, alkyl or arylalkyl group; and wherein Z represents the atoms necessary to form a 5 or 6 membered heterocyclic ring and contains at least one atom selected from N, O, S, and Se; and methods of making same.

REFERENCES:
patent: 2278947 (1942-04-01), Riester
patent: 4169733 (1979-10-01), Iytaka et al.
patent: 4272606 (1981-06-01), Mifune et al.
patent: 4808516 (1989-02-01), Gingello et al.
patent: 4888268 (1989-12-01), Itoh et al.
patent: 4906558 (1990-03-01), Mucke et al.
patent: 5198331 (1993-03-01), Takiguchi et al.

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