Mealey's (July 23, 2020, 2:10 PM EDT) -- BOSTON — In a July 22 order, a federal judge in Massachusetts denied a request for a protective order that would bar three declaratory judgment plaintiffs, pursuant to the doctrine of assignor-estoppel, from challenging the validity of an intravascular blood pump patent (Abiomed Inc., et al. v. Maquet Cardiovascular LLC, No. 16-10914, D. Mass., 2020 U.S. Dist. LEXIS 128854)....