Verification method using pressure and heat-sensitive chromogenic system
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United States of America Patent
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Jan 21, 1997
Grant Date -
N/A
app pub date -
Nov 16, 1994
filing date -
Jun 14, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure and heat-sensitive composition comprising chromogen-containing pressure-rupturable microcapsules and heat-sensitive color developer useful for verification of document authenticity system when applied as a localized coating on documents, such as checks and prescriptions. Quickly striking the chromogenic composition with a fingernail or blunt object to generate pressure and heat in the coating produces a colored image by friction. The chromogenic composition possesses a fugitive characteristic, whereby the colored image gradually disappears and can be made to reappear when the chromogenic coating is again subjected to external pressure and heat. This feature can be used for repeated verification of the authenticity of the document.
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