The Wisconsin Alumni Research Foundation has filed a federal lawsuit against Apple claiming the company’s signature A7 chip infringes upon a WARF patent, according to CNET.

WARF, the patent-licensing arm of the University of Wisconsin, claims the A7 processing chip first introduced in the iPhone 5s in September, infringes on their 1998 patent entitled “Table Based Data Speculation Circuit for Parallel Processing Computer,” according to AppleInsider.

The A7 chip also central to the iPad Air and current generation iPad mini. Apple claims the A7 is twice as fast as its predecessor, the A6.

The inventors listed on the patent include current engineering professor Gurindar Sohi and former computer science professors Andreas Moshovos, Scott Breach and Terani Vijaykumar.

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