Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Xavier Bengoechea0
Richard Grich0
Francesco Finizio0
Date of Patent
October 23, 2007
Patent Application Number
11713967
Date Filed
March 5, 2007
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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