Qualcomm is asking the U.S. Court of Appeals for the Ninth Circuit to intervene in the massive antitrust class action certified last month by U.S. District Judge Lucy Koh.

Qualcomm argues in a petition filed Friday that Koh committed multiple errors, including depriving Qualcomm of a hearing before certifying a class of some 250 million cellphone purchasers. “The court’s analysis was deficient in process, reasoning, and result,” Qualcomm states in the petition, which is signed by Keker, Van Nest & Peters partner Robert Van Nest.