Attorneys for Arm , and Qualcomm grilled a former Apple executive on Tuesday about a key question for the future of the chip industry: Who owns the intellectual property built on top of Arm's computing architecture?

Lawyers for Arm Holdings and Qualcomm are set to make closing arguments on Friday in a case that could upend Qualcomm's push into the PC market with a chip meant to rival Apple and Intel on speed. An eight-person jury in a U.

A jury sided with Qualcomm on two of three key points, but couldn't reach a verdict on the third, resulting in a mistrial. The judge cautioned against a new trial and recommended mediation.