The Washington Redskins can keep their name and logo after a judge reversed a verdict that the trademarks disparaged native Americans.
US District Court Judge Colleen Kollar-Kotelly ruled the earlier decision was "unsupported by substantial evidence, is logically flawed and fails to apply the correct legal standard to its own finding of facts".
The initial judgement had come from the the US Trial Trademark and Appeals Board, which held that the trademarks may be disparaging.
Washington have been known as the Redskins since the team moved to the US capital from Boston in 1937.
Redskins owner Daniel Snyder said: "We are pleased with the judge's finding.
"This team has always treated its name and trademarks with the utmost respect, and our fans worldwide understand and acknowledge the tradition of the Washington Redskins."
Limbaugh sparked controversy by saying Philadelphia quarterback Donovan McNabb is overrated because the media wanted to see a black quarterback succeed.
After defending his comments on his nationally syndicated radio show, Limbaugh issued announcing his resignation.
"My comments this were directed at the media and were not racially motivated," he said in a statement.
Rating's for ESPN's Sunday NFL Countdown programme were up by 10% since Limbaugh joined the show this year.