Paul R. Michel served as a Circuit Judge of the U.S. Court of Appeals for the Federal Circuit from 1988 to 2010, including a six year tenure as Chief Judge from 2004 to 2010. Here, he reflects on judicial treatment of patent eligibility law—from the Supreme Court’s decision in Mayo Collaborative Services v. Prometheus Laboratories, Inc. in 2012 through Friday’s set of opinions in American Axle & Manufacturing, Inc. v. Neapco Holdings LLC.
The law of patent eligibility has been a hopeless mess ever since the Mayo decision upended three decades of stable and predictable law described in Diehr in 1981.