A federal judge declined to throw out a trademark infringement lawsuit brought by the iconic Chicago Billy Goat Tavern, which has sued a St. Louis potato chip company for using its namesake.U.S. District Judge Robert M. Dow Jr. found that “there are too many unknown and disputed facts” that prevented him granting the Billy Goat Chip Co. LLC’s motion to dismiss based on the doctrine of laches, the argument that the Billy Goat Tavern waited too long to take legal action.The Billy Goat Tavern sued The Billy …