On October 15, 2014, the Supreme Court hears oral argument in Teva Pharmaceuticals v. Sandoz, a pharmaceutical patent case that could clarify critical issues of claim construction in patent litigation as well as the relative power of trial courts and appellate courts in such matters. Professor David Schwartz (IIT Chicago-Kent College of Law) discusses the background of the case and the central issue: What is the proper standard of review that the appellate court should use to review claim constructions of a patent done by trial courts?