Pressure-sensitive verification system and use thereof
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United States of America Patent
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-
Feb 25, 1997
Grant Date -
N/A
app pub date -
Oct 6, 1994
filing date -
Jun 14, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressure-sensitive, laser printer heat-resistant verification system for preventing unauthorized photoduplication of security documents comprising a support bearing an information area comprising a visible principal image, and a verification area comprising a localized, autogenous coating of a pressure-sensitive chromogenic composition for producing a visible colored image by external pressure. The chromogenic composition comprises (a) pressure-rupturable microcapsules containing a chromogen and (b) a color developer capable of reacting with the chromogen to form a visible image. The pressure-rupturable microcapsules and color developer are substantially coextensive on the support, and the verification area is spaced apart from the information area.
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