System and methods for filtering electromagnetic visual, and...

Details System and methods for filtering electromagnetic visual, and... System and methods for filtering electromagnetic visual, and...

2007-11-13

2007-11-13

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

C359S361000, C359S585000, C359S590000

Reexamination Certificate

active

11611216

ABSTRACT:
A combination of filters for filtering selected wavelengths of electromagnetic radiation is provided on a transparent substrate such as a plastic film or glazing of a window. The combination of filters prevents or attenuates the passage of wavelengths through the substrate which would pose a security risk. The combination of filters is useful to prevent unauthorized data collection and information exchange from or within buildings or otherwise prevent such unauthorized data collection and information exchange from, for example, computer monitors or screens, personal digital assistance, and local area networks. The substrate with the combination of filters may be in the form of a bag or a tent.

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