Optically variable security device
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United States of America Patent
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May 30, 2006
Grant Date -
Mar 27, 2003
app pub date -
Jun 27, 2001
filing date -
Jun 28, 2000
priority date (Note) -
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Abstract
An optically variable security device comprising a thin film reflection filter structure (23) which exhibits a first optically variable effect; and a relief structure (20) on or in the thin film reflection filter structure which exhibits a second optically variable effect.
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