Online Article 82.3 Our Divided Patent System John R. Allison Mary John and Ralph Spence Centennial Professor of Business Administration, McCombs School of Business, The University of Texas at Austin Mark A. Lemley William H. Neukom Professor of Law, Stanford Law School; partner, Durie Tangri LLP David L. Schwartz Professor of Law and Co-director, Center for Empirical Studies of Intellectual Property, IIT Chicago-Kent College of Law Empirical Analysis Intellectual Property Patent