BOSTON--(BUSINESS WIRE)--Intellectual property law firm Wolf, Greenfield & Sacks, P.C. today announced John L. Welch has joined the firm as Counsel. Mr. Welch becomes a member of the firm’s prominent Trademark Group, where his decades of experience leading patent, trademark, copyright prosecution and litigation matters across the country will benefit Wolf Greenfield’s world-class clients. Mr. Welch is a frequent author and lecturer on trademark law, and particularly on the procedure and jur