Qualcomm added yet another layer to its ongoing legal battle with Apple by accusing the iPhone maker of stealing software and tools to help improve chips from rival Intel Corp.

The San Diego-based chipmaker is asking a judge to add consideration of the latest accusations to a case between the two in state court in California, according to filings obtained by Bloomberg that weren’t immediately available online. The suit is due to go to trial in April next year.

Qualcomm’s assertions are the latest wrinkle in more than 70 suits and counter suits between the two spanning the globe. Apple started the legal fight by accusing its former supplier of illegally using dominance of the market for phone processors and modems to force it to pay unfair technology licensing fees.

Qualcomm has responded by saying Apple is stealing its intellectual property and the legal assault is really a commercial dispute aimed at securing lower prices to increase profitability.

Apple now uses Intel modems, chips that help connect smartphones to cellular networks to access data and voice, exclusively in the latest versions of the iPhone. Qualcomm says that Apple helped Intel engineers to fine tune the modems to improve performance using its software and tools. That’s in breach of the terms of the licenses of that software — provided to Apple when the company used Qualcomm modems — and is the basis for damage claims.

“Apple has engaged in a years-long campaign of false promises, stealth, and subterfuge designed to steal Qualcomm’s confidential information and trade secrets for the purpose of improving the performance and accelerating the time to market of lower-quality modem chips, including those developed by Intel,” Qualcomm said in a court filing Tuesday. “Apple used that stolen technology to divert Qualcomm’s Apple-based business to Intel.”

Qualcomm said it gave the software and tools to Apple with strict restrictions on their use. Apple demanded access to make updates to the software that runs the chips in order to make them work better in the iPhone, Qualcomm said.

Apple began using Qualcomm modems in 2011 and migrated to using it exclusively for that part. In 2016, Apple then went back to using using some Intel parts before beginning the legal dispute with Qualcomm in early 2017. It now exclusively uses Intel in the most recent iPhones.

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