By Megan Leonhardt

Law360, New York (January 25, 2012, 3:07 PM ET) -- A Pennsylvania federal judge on Wednesday tossed an unfair competition and trademark infringement suit against Microsoft brought by Kinbook LLC, saying the small software company had failed to show Microsoft’s Kinect gaming device trademarks were confusingly similar to its “Kinbox” mark.

U.S. District Judge Gene E.K. Pratter granted Microsoft’s motion for summary judgment, finding that there was no likelihood of confusion between Kinbook’s “Kinbox” Facebook application and Microsoft’s Kinect device for its Xbox 360 console and the short-lived Kin phone.

“The visual appearances of the these...