SurfCast, in a complaint filed yesterday in a U.S. District Court in Maine, said Microsoft infringes one of its four patents -- No. 6,724,403 -- by "making, using, selling, and offering to sell devices and software products" covered by SurfCast's patent. That includes mobile devices using the Windows Phone 7 and Windows Phone 8 operating systems as well as PCs using Windows 8/RT.
This is a drawing of their patent:
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