Process for checking the authenticity of documents as well as ap

Details Process for checking the authenticity of documents as well as ap Process for checking the authenticity of documents as well as ap

1984-03-02

1987-01-06

Howell, Janice A.

Radiant energy

Luminophor irradiation

2504611, 2504721, F21V 916, G01T 104

Patent

active

046348727

ABSTRACT:
Process and apparatus for checking the authenticity of valuable documents by subjecting the document to be checked in a closed room to at least incident light, transmitting and floodlight, especially floodlight at angles of 0 tot 15.degree.. Apparatus is described with document examination places without relative interference of the different radiation.

REFERENCES:
patent: 2059197 (1936-11-01), Backer et al.
patent: 2099012 (1937-11-01), Goodrich et al.
patent: 3842281 (1974-10-01), Goodrich

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