Qualcomm Inc on Monday kicked off a patent challenge to Apple Inc, capping off a two-year legal strategy to put pressure on the iPhone-maker before a major antitrust lawsuit between the two goes to trial in April. Qualcomm has alleged in a federal court in San Diego that Apple has violated three of its patents, and is asking for tens of millions of dollars or more in damages.

The patent case is part of a two-year series of lawsuits around the world between the companies. Apple has alleged that Qualcomm engaged in illegal patent practices to protect a dominant position in the chip market, and Qualcomm has accused Apple of using its technology without compensation. The legal saga will reach a crescendo in April, when an antitrust case filed by Apple in early 2017 heads to trial and challenges the foundation of Qualcomm’s business model.

US District Judge Dana Sabraw will open an eight-day trial on Monday to determine whether Apple violated Qualcomm patents around helping phones turn on more quickly and save battery life during tasks . Apple has responded in court papers that it does not believe the patents are valid and that it does not infringe them.

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