"A years-long effort to cancel six Washington Redskins' federal trademarks is scheduled for trial next month before the U.S. Patent and Trademark Office's Trademark Trial and Appeal Board, according to board documents.

The petition by five Native Americans, Blackhorse vs. Pro-Football, Inc., asserts the team's name and logo are offensive. Filed in 2006, it's identical to an earlier case, Harjo vs. Pro-Football, Inc.

In the Harjo case, started in 1992, the Trademark Trial and Appeal Board canceled the six trademarks in 1999. That was overturned on appeal when the U.S. Court of Appeals for the District of Columbia ruled the seven petitioners waited too long to file suit against trademarks first granted in 1967 and there wasn't sufficient evidence for the board to cancel the trademarks. The case ended in 2009 when the Supreme Court declined to hear an appeal."