Document with an unforgeable surface

Details Document with an unforgeable surface Document with an unforgeable surface

1988-11-25

1991-01-29

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 74, 283 91, 283902, 283904, 283107, B42D 1500

Patent

active

049881264

ABSTRACT:
Documents and data, patterns, etc., applied thereto, which are present in the form of a surface relief, in particular in the form of embossed characters, are provided partially in the area of this surface relief with luminescent substance which is testable visibly and by machine. The luminescent substance is introduced either into raised or into depressed areas of the surface relief, so that characteristic features of the surface relief are reflected in its spatial distribution. The data can thus be tested for falsification and at the same time for authenticity in a simple way.

REFERENCES:
patent: 3363346 (1968-01-01), Wittboldt
patent: 3577917 (1971-05-01), Nantz
patent: 3831008 (1974-08-01), Bradshaw
patent: 3917925 (1975-11-01), del Rio
patent: 4500116 (1985-02-01), Ferro et al.
patent: 4507346 (1985-03-01), Maurer et al.
patent: 4527051 (1985-07-01), Stenzel
patent: 4597592 (1986-07-01), Maurer et al.
patent: 4597593 (1986-07-01), Maurer
patent: 4627642 (1986-12-01), Peronneau et al.
patent: 4783823 (1988-11-01), Tasaki et al.

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