Sony and Toshiba have been sued in a patent dispute with Wisconsin Alumni Research Foundation (WARF), the University of Wisconsin-Madison's commercial arm.
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WARF filed a patent suit on 20 October. The Emotion Engine integrated circuit, designed by Toshiba and used in Sony's PlayStation 2 console, infringes US patent 4,630,094, WARF said.
The patent, issued on 16 December 1986, is titled "Use of metallic glasses for fabrication of structures with submicron dimensions" and covers products including the Emotion Engine and other integrated circuits using copper interconnect technology that are already being marketed by Toshiba, WARF said.
The technology was first developed by John Wiley and John Perepezko of the University of Wisconsin-Madison.
Sony and Toshiba have 20 days to respond to the filing.
Gillian Law writes for IDG News Service