Drinker Biddle & Reath spent more than 10 years, almost 9,000 billable hours and $3.5 million in pro bono legal services working to get the Washington Redskins’ trademark registrations canceled.

The pro bono work, which reached a milestone victory Wednesday with the U.S. Patent and Trademark Office canceling the registration for the “disparaging” marks, also meant the firm was forced to miss out on potentially lucrative work related to the NFL.