Security features
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United States of America Patent
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Sep 3, 2002
Grant Date -
Jul 11, 2002
app pub date -
Dec 29, 1999
filing date -
Dec 29, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to improvements in security features in paper and other substrates and in particular to an activatable feature to warn of tampering. The invention further relates to a security feature for a security document comprising at least one activatable layer and at least one visually apparent masking layer, said at least one activatable layer comprising a composition which is generally non-mobile but which becomes mobile when wetted with a liquid, said composition further including at least one detectable component, in which under dry conditions said at least one masking layer wholly covers the activatable layer and renders it non-detectable.
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