InterDigital Communications, LLC, told the Federal Circuit on Thursday that an administrative law judge used improper claim constructions when he ruled for Nokia Inc., in a patent battle over wireless 3G technology imported to the U.S. A three-judge panel of the U.S. Court of Appeals for the Federal Circuit heard oral arguments from InterDigital and Nokia on how to properly construe the term “spreading code.” The investigation began in 2007, when InterDigital brought Section 337 claims that Nokia had engaged in unfair trade practices by importing the allegedly infringing 3G handsets into the U.S. The U.S. International Trade Commission (ITC) terminated its investigation into whether Nokia was infringing InterDigital's patents when it affirmed an August 2009 determination by Administrative Law Judge Paul J. Luckern, who held that four InterDigital patents were valid and enforceable, but that Nokia had not infringed them. InterDigital is represented by Finnegan.