HTC Corp. has won $4 million in “exceptional case” attorney fees in a high-profile case of inequitable conduct, leaving Niro, Haller & Niro and a former client to fight over who pays the bill.

U.S. District Judge William Hart of the Northern District of Illinois entered judgment Tuesday, six months after sanctioning the Niro firm and five individual lawyers, including Raymond Niro Sr., for pressing a meritless patent suit despite the client’s warning that he had filed false declarations during patent prosecution.