November 25, 2013
A Texas federal judge on Monday agreed to knock three of AT&T Inc.’s contested four E911 mobile centers out of a battle over whether its mobile locator systems infringe a patent owned by TracBeam LLC, finding that three of AT&T’s four E911 mobile centers didn’t perform a function essential to the patent’s system. (Correction: An earlier story and headline incorrectly reported that AT&T's three nontesting centers were eliminated from the suit, and the story incorrectly reported an argument over the patent for mobile base stations. The errors have been corrected.)
February 28, 2011
A Colorado patent-holding company on Friday accused AT&T Inc., Sprint Nextel Corp. and other telecom giants of infringing two wireless locator patents.