The Federal Circuit has just created a new jurisdictional pitfall for NPEs seeking to litigate where they choose. On May 12, the appellate court held in Trimble v. PerDiemCo (19-2164) that there is no rule preventing courts from exercising specific personal jurisdiction over patent owners based on the sending of demand letters into the forum at issue. The decision could potentially make some NPEs vulnerable to declaratory judgment actions filed by accused infringers in venues commonly seen as less hospitable to patent owners.