Clear to colored security film
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 4, 2000
Grant Date -
N/A
app pub date -
Jan 13, 1998
filing date -
Jan 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A multilayer film including multiple polymeric layers designed and made to enable the film to reflect light in the near infrared (IR) portion of the visible spectrum. Depending on the amount and range of red light that is reflected, the film of the present invention appears under certain conditions to exhibit a visible color, commonly cyan. The film appears to be substantially clear when viewed against a diffuse white background from approximately a zero degree observation angle, and appears to be cyan when viewed against that background from an observation angle that is greater than a predetermined shift angle.
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Family
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Cited Art Landscape
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