Thin film optical variable article having substantial color shift with angle and method
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United States of America Patent
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Nov 10, 1987
Grant Date -
N/A
app pub date -
Jul 13, 1984
filing date -
Jul 13, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Thin film optically variable article having substantial color shift with varying angle of light incidence and viewing and including an optically thick, substantially transparent element carrying a colorant and having first and second surfaces. A multilayer interference coating is carried on one of said first and second surfaces. The colorant serves to modify in essentially a subtractive mode the color at normal incidence and the color shift with angle of the multilayer interference coating as seen by reflection or transmission.
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