Foley Hoag LLP - Trademark, Copyright & Unfair Competition (JD Supra Puerto Rico)

In the U.S., a senior user of a trademark can block a junior user within the geographic area of prior use, even if the junior user is the party with an incontestable U.S. federal registration. This is perfectly illustrated in a recent First Circuit decision.

In a case on appeal from the District of Puerto Rico, the First Circuit held that the “doctrine of progressive encroachment” defeated a junior user’s laches defense, despite the fact that the junior user had been co-existing with the senior user for decades.