Qualcomm won a legal victory against Apple on Friday when a federal jury in San Diego found that Apple owed the mobile phone chip supplier about $31 million for infringing on three of its patents.

Qualcomm sued Apple last year, accusing it of violating patents related to improving mobile phones’ battery life.

During an eight-day trial in the United States District Court for the Southern District of California, Qualcomm asked the jury to award it unpaid patent royalties of up to $1.41 per iPhone that violated the patents.

“The technologies invented by Qualcomm and others are what made it possible for Apple to enter the market and become so successful so quickly,” Don Rosenberg, Qualcomm’s general counsel, said in a statement.