Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 6, 2007
Patent Application Number
10156364
Date Filed
May 28, 2002
Patent Citations Received
Patent Primary Examiner
Patent 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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