Surveillance window
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United States of America Patent
Stats
-
Mar 6, 2007
Grant Date -
May 22, 2003
app pub date -
May 28, 2002
filing date -
Nov 21, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A surveillance window including at least one set of linear polarizer and quarter-waveplate and a reflecting surface. The surveillance window appears dull and opaque to a subject, while allowing a relatively high percentage of light to be transmitted to an observer. Various enhancements including an illuminator and detector, camouflaging, fire resistance, and improvements to the opacity are also described.
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Family
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Cited Art Landscape
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