Tendler Cellular of Texas (TCT) [NPE] filed suit against Ford, Mercedes, and MetroPCS, alleging that defendants’ location based services infringe a patent related to using a wireless phone equipped with a GPS receiver, antenna, and voice synthesis capability to locate a vehicle.  TCT has filed two prior suits since March 2009 against over 20 defendants including AT&T, MetroPCS, Nextel, Sprint, and T-Mobile.   11/15, Eastern District of Texas, 6:2011cv00619.