Tamper-resistant article and method of authenticating the same

Details Tamper-resistant article and method of authenticating the same Tamper-resistant article and method of authenticating the same

1992-10-14

1995-04-04

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283903, 283 93, 283 94, 359 43, 359288, B42D 1500

Patent

active

054030390

ABSTRACT:
A printed document, such as a lottery ticket, includes a thermochromic layer at least over the imprinted data region. The printed document can be authenticated by applying heat to the thermochromic material and observing the presence or absence of a reversible color change.

REFERENCES:
patent: 4488646 (1984-12-01), McCorkle

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