The Chicago-based intellectual property boutique Niro Law, a firm that became known for filing often-exasperating lawsuits on behalf of patent trolls, is about to permanently shut its doors. The move comes five months after the death of its founder, Raymond Niro Sr.

Niro, a well-known figure in the world of IP litigation who was once called the original “patent troll,” died in August at age 73 while vacationing in Italy.