Tamper evident optically variable device and article utilizing the same
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United States of America Patent
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Jan 26, 1988
Grant Date -
N/A
app pub date -
Aug 7, 1986
filing date -
Aug 7, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Tamper evident optically variable device comprising an optically variable device having at least first and second layers with a spacer layer therebetween providing a color shift with change in viewing angle. A release layer is disposed between the first and second layers to permit the first and second layers to be separated from each other and to thereby destroy the optical shifting properties of the optically variable device.
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