US Patent 7948674 - Electro-optic window with CNT RF shield

http://www.freepatentsonline.com/7948674.html

Infrared imaging systems often require some RF shielding to protect from interference or damage to electronics. This patent from BAE Systems teaches using carbon nanotubes to achieve the shielding. Claim 1 reads:

1. An electro-optic window comprising

a material substantially transparent to at least one selected from the group consisting of infra-red and visible radiation,

the material being treated to have reduced RF transmission characteristics by the provision of carbon nanotubes provided as a layer on at least one surface of the window,

wherein the at least one layer of carbon nanotubes has a mat structure and includes an array of holes.