Method and apparatus for authenticating documents utilizing pole

Details Method and apparatus for authenticating documents utilizing pole Method and apparatus for authenticating documents utilizing pole

1987-03-27

1988-12-20

Pellinen, A. D.

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Records

Laminated

235441, 235492, 283 72, G06K 1900

Patent

active

047926678

ABSTRACT:
A method and apparatus for authenticating documents, utilizing the ferroelectric properties of poled polymeric materials. The properties displayed by the poled materials are detected in order to authenticate the documents to which they are affixed. The poled polymeric material can be used as a protective coating or covering for an indentifying photograph and/or signature and can be applied to a document in such a fashion that heat is needed to remove it. The ferroelectric properties of the poled polymeric material virtually disappear when the material is subjected to critical temperatures, such as those necessary to remove the material from the document. The absence of these properties therefore, signifies that the document has been tampered with.

REFERENCES:
patent: 4098940 (1978-07-01), Groh et al.
patent: 4350883 (1982-09-01), Lagarde
patent: 4544836 (1985-10-01), Galvin et al.
patent: 4650979 (1987-03-01), Stockburger et al.
patent: 4659112 (1987-04-01), Reiner et al.

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