Credit and identification cards having pieces of diffraction gra

Details Credit and identification cards having pieces of diffraction gra Credit and identification cards having pieces of diffraction gra

1983-11-10

1985-10-15

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

264132, 283 85, 283 86, 283 87, 283904, B42D 1500

Patent

active

045470022

ABSTRACT:
An information bearing credit or identification card in which pieces of a diffraction grating, preferably an embossed hologram, are randomly distributed in a plastic or paper card so that light reflecting therefrom uniquely and visually differentiates the grating and hence the card. The pieces may be mixed in the plastic pig or with the paper prior to rolling or sprinkled in the plastic or other substrate during rolling.

REFERENCES:
patent: 3552853 (1971-01-01), Sanders et al.
patent: 4101701 (1978-07-01), Gordon

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