A jury this week found Apple guilty of using technology owned by the University of Wisconsin-Madison's licensing arm without consent.

According to Reuters, the iPhone maker could face up to $862 million in damages for infringing on a patent that improves chip efficiency.

The University's non-profit patent management body, Wisconsin Alumni Research Foundation (WARF), sued Apple in January 2014, claiming Cupertino infringed on WARF patents with its A7, A8, and A8X processors, which are found in the iPhone 5s, 6, and 6 Plus, and the iPad.

Apple denied the accusations and argued that the patent is invalid, Reuters reported. It also unsuccessfully lobbied for the U.S. Patent and Trademark Office to review WARF's patent legality.

The court must decide how much Apple must pay.

WARF last month filed a second lawsuit against Cupertino over its newer A9 and A9X chips, which are in the next-gen iPhone 6s, 6s Plus, and iPad Pro.

The group sued Intel on similar grounds in 2008 over its Core 2 Duo CPU, but the case was settled out of court.

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In the fall of 2013, Apple released its iPhone 5s with the new A7 mobile chip, featuring the ARMv8 architecture. At the time, the A7 offered a hefty performance bump over its predecessor.

The A8 chip made its debut last year in Cupertino's iPhone 6 lineup; it was also integrated into the new iPods, promising 10 times faster graphics performance and better fitness tracking.

Apple declined to comment, while WARF did not immediately respond to a request for comment.

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