Patent ID: 7295368
Filing Date: 2007-11-13
Classification: B32B,G02B,G06F,H05K,Y04S,Y10T

Abstract:
1. A transparent anti-surveillance security apparatus for preventing or attenuating the passage therethrough of electromagnetic wavelengths which pose a security risk; said apparatus comprising a transparent substrate and a combination of filters connected to said substrate, said combination of filters comprising a first light filter, wherein said first light filter comprises a plurality of dielectric and IR reflecting metal layers, wherein said dielectric of each dielectric layer has an index of refraction in the range of about 1.35 to 2.6, and wherein said light filter has an IR transmission at wavelengths between 780 nm and 2500 nm of no more than 50% and has a sheet resistance of less than 4 ohms per square to attenuate radio frequency interference (RFI).