Strategy Informer  

Microsoft has been denied a trademark renewal of Killer Instinct, Rare's 1994 coin-op fighting game that was released on the Super NES in 1995.

The reason the trademark was refused renewal was curiously due to a short-lived 2005 television show of the same name. According to the court, granting the trademark renewal could "cause confusion".

Microsoft is appealing the decision.

Source: Game Informer