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

1992-02-28

1993-03-16

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 93, 283 94, 283902, 283903, 359 43, 359288, B42D 1500

Patent

active

051938545

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:
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patent: 4120445 (1978-10-01), Carrier et al.
patent: 4227719 (1980-10-01), McElligott et al.
patent: 4241942 (1980-12-01), Bachman
patent: 4407443 (1983-10-01), McCorkle
patent: 4488646 (1984-12-01), McCorkle
patent: 4936916 (1990-06-01), Shinmitsu et al.

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