Document having light-transmissive, electrically conductive auth

Details Document having light-transmissive, electrically conductive auth Document having light-transmissive, electrically conductive auth

1983-12-27

1986-05-27

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

And electrically conductive material

283 91, 428204, B42D 1500, B32B 714

Patent

active

045911894

ABSTRACT:
A standardized document such as a credit card has a thin, light-transmissive, electrically conductive interior layer, the impedance, capacitance, or conductance of which can be sensed to indicate the authenticity of the document. When the document is cut to expose a new edge, the authenticating layer at that edge is not visible to the naked eye and hence should foil the ordinary counterfeiter.

REFERENCES:
patent: 3755935 (1973-09-01), Annenberg
patent: 3765994 (1973-10-01), Quaintance et al.
patent: 3801183 (1974-04-01), Sevelin et al.
patent: 3802101 (1974-04-01), Scantlin
patent: 3876865 (1975-04-01), Bliss
patent: 3998160 (1976-12-01), Pearce
patent: 4020389 (1977-04-01), Dickson et al.
patent: 4223918 (1980-09-01), Smoczynski
patent: 4290630 (1981-09-01), Lee
patent: 4409471 (1983-10-01), Aigo
patent: 4432567 (1984-02-01), Stockburger et al.
patent: 4443027 (1984-04-01), McNeely et al.
patent: 4455039 (1984-06-01), Weitzen et al.

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