Flexible card with validity checking device

Details Flexible card with validity checking device Flexible card with validity checking device

1994-07-15

1996-10-22

Fridie, Jr., Willmon

Printed matter

Having revealable concealed information, fraud preventer or...

And electrically conductive material

283 91, B42D 1500

Patent

active

055669824

ABSTRACT:
An identity card or credit card type of card is equipped with a validity-checking device that makes it possible to do away with the use of complementary, sophisticated checking equipment. It results from the association of a structure S.sub.1 comprising at least one layer of piezoelectric material and a structure S.sub.2 comprising a material capable of switching electrically between two optical states (I) and (II) that are different in terms of ocular perception. During the bending of the card, the validity or non-validity of the card can be attested to by the appearance or non-appearance of the validity of the card.

REFERENCES:
patent: 4223918 (1980-09-01), Smoczynski
patent: 4579371 (1986-04-01), Long et al.
patent: 4763927 (1988-08-01), Schneider
patent: 4792667 (1988-12-01), Chen

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