Photographic multilayer direct-positive silver halide element

Details Photographic multilayer direct-positive silver halide element Photographic multilayer direct-positive silver halide element

1974-01-11

1976-06-15

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 64, 96107, G03C 176, G03C 524, G03C 128

Patent

active

039634949

ABSTRACT:
A photographic multilayer direct-positive silver halide element is provided comprising at least two direct-positive fogged silver halide emulsion layers the undermost emulsion layer comprising one or more non-spectrally sensitizing electron acceptors and the uppermost emulsion layer comprising one or more electron-acceptors at least one of which is a spectrally sensitizing electron acceptor. The direct-positive element has reduced gradation and extended exposure latitude.

REFERENCES:
patent: 2930694 (1940-03-01), Coeenew et al.
patent: 3314796 (1957-04-01), Gotze et al.
patent: 3501307 (1970-03-01), Illingsnorth
patent: 3501312 (1970-03-01), DeeMee et al.
patent: 3615610 (1971-10-01), Florens et al.
patent: 3746549 (1973-07-01), Corretore, Jr. et al.
patent: 3854953 (1974-12-01), Shiba et al.

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