Security document and method of testing same

Details Security document and method of testing same Security document and method of testing same

1986-07-01

1988-04-26

Kazenske, E. R.

Printed matter

Method

Identifying

282 27A, 427259, 428916, B42D 1500, B41L 116, B05D 132, G09F 300

Patent

active

047400153

ABSTRACT:
A security document having first and second areas on one side coated or treated with complementary compositions of the types that will leave a mark when pressed together, with some areas of one composition desensitized, so that the authenticity of the document may be tested by folding the document to place the areas together and then exerting pressure thereon.

REFERENCES:
patent: 1567156 (1925-12-01), Lohff
patent: 2396833 (1946-03-01), D'Humy
patent: 2618574 (1952-11-01), Pavlic
patent: 3227474 (1966-01-01), Hoeflinger
patent: 3248808 (1966-05-01), Daker et al.
patent: 4165101 (1979-08-01), Sternberg
patent: 4360548 (1982-11-01), Skees et al.
patent: 4397483 (1983-08-01), Hiraishi et al.
patent: 4496961 (1985-01-01), Devrient

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