Method of using thermochromic material on security documents and product
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United States of America Patent
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-
Oct 27, 1998
Grant Date -
N/A
app pub date -
May 1, 1995
filing date -
Feb 17, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of document security comprising providing a substrate having a spot of thermochromic material printed thereon capable of undergoing a reversible color change upon exposure to heat, associating alpha instructional information with the spot, reproducing the alpha information on a second substrate, and subjecting the second substrate to heat to determine whether the document is original or authentic.
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