The experimental use exception, part of U.S. patent law for nearly two centuries, is becoming obsolete. Recent court decisions and changes under the America Invents Act (AIA)1 have raised doubts about the continued viability of the doctrine. Additionally, other legal provisions that offer protections similar to those of the experimental use doctrine and reduce the need for the its use have gained prominence. This article explores the development and current state of the experimental use exception and its place in patent law.2