British telecoms firm BT has launched legal action against Google in the United States over patent infringement in a number of key areas for the technology group such as mobile map services.

BT, Britain's dominant fixed-line telecoms group, said in a statement on Monday that it had filed a claim with the U.S. District Court of Delaware for patent infringement.

The BT claim relates to six patents which BT says are infringed by such services as Google's highly successful mobile platform Android, Google Maps, Google Music, advertising services, gmail and other products.