Security threads
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United States of America Patent
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Nov 7, 1995
Grant Date -
N/A
app pub date -
Jan 19, 1994
filing date -
Jan 20, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A security thread (11) for use in security articles (10), includes a substrate having a coating on one or both sides thereof, the coating containing a thermochromic material selected from pigments and dyestuffs which changes from coloured to colourless when the temperature of the pigment or dyestuff is changed to the activation temperature. The thermochromic material may be coloured when the temperature is below the activation temperature and become colourless when the material is at the activation temperature or above. The thread (11) is for security paper (10) for use in producing banknotes and the like.
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