Method and apparatus for authenticating documents utilizing poled polymeric material
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United States of America Patent
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-
Dec 20, 1988
Grant Date -
N/A
app pub date -
Mar 27, 1987
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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