The Wisconsin Alumni Research Foundation sued Apple in January 2014 alleging infringement of its 1998 patent for improving chip efficiency. Apple denied infringement and argued that the patent was invalid. It tried to convince the USPTO to review the patent's validity but the agency denied the request in April.
The case is being presided over by U.S. District Judge William Conley and it's estimated that Apple could be liable for up to $862.4 million in damages.
The trial is being sectioned into three phases: liability, damages, and a determination of willful infringement.
WARF launched a second lawsuit against Apple last month, targetting its A9 and A9X chips in the iPhone 6S and 6S Plus, as well as the iPad Pro.
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