SAN FRANCISCO — An inventor who’s at the center of an attorney fee brawl between Sheppard, Mullin, Richter & Hampton and Niro, Haller & Niro wants to disqualify Sheppard Mullin from the case, saying he just realized he was once a client of the firm.

Intellect Wireless CEO Daniel Henderson filed a motion to disqualify last week, submitting records showing Sheppard Mullin represented a patent assertion entity owned by Henderson as recently as 2008. By 2010, Sheppard Mullin and HTC were accusing him in federal court of inequitable conduct at the U.S. Patent and Trademark Office.