Frustrated internal reflection touch screens

Having been browsing the internet for quite a while on different touch screen technologies, I’ve been really interested in the frustrated total internal reflection technique of detecting finger positions on a screen, clear object (see: http://www.youtube.com/watch?v=GfdGF9yvkTM), It looks much more viable than resistive or capacitive touch screens for certain products as it doesn’t need the ITO traces! I wonder if this tech is patented? If anybody knows, drop a comment!

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