Mealey's (January 4, 2019, 10:20 AM EST) -- WASHINGTON, D.C. — A Nevada federal judge erred in finding that argument and amendment-based estoppel bars allegations that a glucose-monitoring system infringes two patents under the doctrine of equivalents, the patent owners assert in a Dec. 18 appellant brief filed with the Federal Circuit U.S. Court of Appeals (Pharma Tech Solutions Inc., et al. v. LifeScan Inc., et al., No. 19-1163, Fed. Cir.)....