Low cost diffraction images for high security application
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United States of America Patent
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Sep 29, 1998
Issued Date -
N/A
app pub date -
May 6, 1996
filing date -
Feb 21, 1996
priority date (Note) -
Expired
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Abstract
A security device includes two plastic layers and a metal layer. The plastic layers may be embossed or surface cast with contrasting surface relief diffraction patterns. A second metal layer may be provided including a pattern of voids through which the first metal layer may be seen by a human observer.
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