Optical device
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United States of America Patent
Stats
-
May 10, 1994
Grant Date -
N/A
app pub date -
Apr 8, 1992
filing date -
Oct 26, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical security device for use on a security article comprises a number of layers including an optically diffracting layer and an at least partially reflective layer which together generate a first image. A non-optically diffracting second image is provided within the device in association with the first image.
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