Direct-positive silver halide emulsion fogged to low level and t

Details Direct-positive silver halide emulsion fogged to low level and t Direct-positive silver halide emulsion fogged to low level and t

1972-12-27

1976-06-15

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96107, 96108, 96101, 96120, G03C 524, G03C 128

Patent

active

039634930

ABSTRACT:
Direct-positive silver halide emulsions are described which have been fogged so that a test portion thereof when coated at a coverage of 0.50 to 5.50 g of silver per sq.m. gives a density below 0.50 upon processing without exposure for 6 min. at 20.degree.C in a developer I and an identical coated test portion gives a density that is at least twice that of the first test portion with a minimum of 0.50 upon processing without exposure for 3 min. at 20.degree.C in a developer II.
The emulsions have high photographic speed and though fogged to a very low degree can yield direct-positive images of satisfactory density.

REFERENCES:
patent: 3367778 (1968-02-01), Berriman
patent: 3501307 (1970-03-01), Illingsworth
patent: 3687676 (1972-08-01), Spence et al.
patent: 3690891 (1972-09-01), Spence et al.
patent: 3730723 (1973-05-01), Gilman et al.
patent: 3767651 (1973-10-01), Chapman

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