Hidden entry or latent image methods and systems

Details Hidden entry or latent image methods and systems Hidden entry or latent image methods and systems

1973-01-11

1978-09-05

Welcome, Joan E.

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106 145, 106 21, C09D 1100, C09D 1300

Patent

active

041117026

ABSTRACT:
The disclosed paper-based feedback systems employ thermographic processes which transfer a pattern of vaporized reactant material such as dithiooxamide (DTO) or DTO derivatives to a treated or untreated paper-like receptor sheet to form a storable latent image, i.e. a hidden entry, on the sheet. The latent image can be developed weeks or months later with a co-reactant metal salt.

REFERENCES:
patent: 2168098 (1939-08-01), Groak
patent: 2748024 (1956-05-01), Klimkowski et al.
patent: 2835600 (1958-04-01), Zgraggen
patent: 2872863 (1959-02-01), Newman et al.
patent: 3076406 (1963-02-01), Florence
patent: 3352794 (1967-11-01), Abdo
patent: 3672842 (1972-06-01), Florin

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