Mealey's (April 7, 2020, 1:12 PM EDT) -- ALEXANDRIA, Va. — Three challengers of a patent directed to systems and methods of payment escrow maintain in an April 3 supplemental brief that the Patent Trial and Appeal Board should proceed with covered business method (CBM) review despite a recent determination in California federal court that the technology is ineligible for patenting (Stripe Inc., et al. v. Boom! Payments Inc., No. CBM2020-00002, PTAB)....