Tamper-proof, color-shift security feature
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United States of America Patent
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Issued Date -
May 17, 2007
app pub date -
Feb 11, 2005
filing date -
Feb 16, 2004
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Abandoned
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Abstract
The invention relates to a tamper-proof security feature that comprises at least one electromagnetic wave-reflecting layer (2), one polymer spacer layer (3) and one metal cluster layer (4). The inventive feature is characterized in that one or more of the layers, in addition to their function, fulfill additional security functions in their color-shift set-up.
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