Mercedes Benz can continue installing in its vehicles a device that detects and rouses drowsy drivers, thanks to a federal judge’s dismissal of a patent- infringement suit.

The plaintiff in Ibormeith IP LLC v. Mercedes-Benz USA, 10-cv-5378, claimed Mercedes’ “attention assist” system, implemented in certain vehicles since 2009, infringed on a 2001 U.S. patent called “Sleepiness Detection For Vehicle Driver or Machine Operator.”