In a 120-page opinion (PDF) released Monday afternoon, a Washington, D.C., federal judge affirmed that a foreign-based law firm with few physical ties to Washington and limited involvement in an underlying case could still be the target of a legal malpractice suit in Washington based on its communications and visits over the years.

U.S. District Judge Reggie Walton upheld the majority of claims brought by Swedish scientist Hakan Lans, who is suing his former attorneys in Sweden and Washington over their handling of patent infringement suits he unsuccessfully pursued starting in the late 1990s. The two defendant firms — Sweden-based Advokatfirman Delphi & Co. and Washington-based Adduci, Mastriani & Schaumberg — had filed motions for dismissal.