Branch Bank and Trust Company (BB&T) filed an action for declaratory judgment against Maxim Integrated Products [NCE], seeking declaration that its mobile banking service does not infringe four patents related to electronic modules used for secure transactions.  Maxim acquired the four patents-in-suit through an assignment in June 2008 from Dallas Semiconductor Corporation, which it acquired in 2001 for approximately $2.5 billion.  According to the complaint, Maxim sent demand letters that included claim charts to BB&T.  Maxim has filed 10 prior suits since January 2012 against defendants including Expedia and Groupon, and has also been subject to seven separate actions for declaratory judgment over the same period.  6/18, Eastern District of North Carolina, Assigned to: Chief Judge James C. Denver, III, 5:2012cv00353.