Koninklijike Phillips (Phillips for short, and you may be aware of this company as they make electronics such as computer accessories) sued Nintendo for infringing two of Phillips' patents with motion technology used for the Wii and Wii U. This lawsuit was filed last month in the U.S.
But what does Nintendo say about this? Invalid. These two patents are invalid.
Source
The suit outlined that Nintendo's Wii, Wii Remote and Wii Remote Plus controllers, Nunchuk, Balance Board, Wii U console, Wii U GamePad, Wii Mini and Wii MotionPlus technology are all in violation of the first patent. The Wii U and GamePad console ecosystem were identified in the suit as infringing upon the second.
But what does Nintendo say about this? Invalid. These two patents are invalid.
Source