Duplication-proof photographic film

Details Duplication-proof photographic film Duplication-proof photographic film

1974-10-15

1979-05-01

Brown, Travis

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 75, G03C 158, G03C 152

Patent

active

041521560

ABSTRACT:
Photographic element designed to prevent duplication by contact copying with actinic light, formed from a synthetic organic polymer having a nitrogen gas permeability suitable for use as a vehicle in a vesicular film, and a light sensitive diazotype composition dispersed therein in which the diazotype composition includes a light decomposable diazonium salt and a coupler for forming a dye with said diazonium salt. Upon image-wise exposure and development, the light-struck areas are vesiculated and an azo dye is formed in the nonlight-struck areas. The image formed from the vesicules relative to the azo dye provide sufficient contrast for viewing by projected light but insufficient contrast for contact copying with UV light.

REFERENCES:
patent: 2699392 (1955-01-01), Herrick et al.
patent: 3260599 (1966-07-01), Lokken
patent: 3408192 (1968-10-01), Aebi
patent: 3411906 (1968-11-01), Boone et al.
patent: 3622333 (1971-11-01), Cope
patent: 3661591 (1972-05-01), Reed
patent: 3904420 (1975-09-01), Hunter

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