Patent ID: 7177075
Filing Date: 2007-02-13
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 is: a light filter (a) comprising a heat reflecting layer and an electrically conductive metal layer, or a light filter (b) having an IR transmission at wavelengths between 780 nm and 2500 nm of no more than 50%, or a light filter (c) which has a sheet resistance of less than 4 ohms per square and comprises a sequence of layers: wherein said sequence of layers is coated onto said substrate or onto a transparent plastic sheet; said apparatus optionally further including an IR absorbing filter; said combination of filters being configured to prevent or attenuate the passage of said electromagnetic wavelengths through said apparatus and said dielectric of each dielectric layer has an index of refraction in the range of about 1.35 to 2.6, further comprising a second light filter which screens UV light.