Evan H. Langdon


t: 202-407-8641
f: 202-466-2006

Evan H. Langdon Photo

Evan H. Langdon is an intellectual property and international trade attorney specializing in Section 337 investigations before the U.S. International Trade Commission and intellectual property litigation in U.S. district courts and appeals before the Federal Circuit.  He also counsels clients on patent infringement, invalidity and other intellectual property issues involving patents, trademarks and trade dress, and copyrights.

Prior to joining the firm, Evan served as a primary examiner at the United States Patent and Trademark Office where he examined patent applications and completed a clerkship for an Administrative Patent Judge at the Board of Patent Appeals and Interferences.  He also practiced at a large DC-based law firm where he focused on patent prosecution.

Evan applies this experience to effectively represent foreign and domestic businesses on issues specific to the International Trade Commission, as well as on patent-related issues in Section 337 investigations and U.S. district court litigation.  His litigation experience covers a broad range of technologies including mobile electronic devices and chipsets, data processing systems, lighting control devices, consumer electronics and accessories, household appliances, and various mechanical devices.

He has represented clients in enforcement proceedings and accelerated hearings, and was involved in many of the Commission's recent high-profile cases and litigation.  Evan has successfully obtained multiple general exclusion orders.  His experience encompasses all phases of litigation, including all aspects of discovery, motions practice, deposing and preparing key fact and expert witnesses, trial activity, and pre- and post-trial activity.  He also assists clients with pre-filing due diligence and post-investigation enforcement efforts.

Evan is a contributing author to the second edition of the American Bar Association’s book entitled "A Lawyer’s Guide to Section 337 Investigations Before the U.S. International Trade Commission."




  • The Catholic University of America, Columbus School of Law, J.D., magna cum laude
  • Executive Editor, Journal of Contemporary Health Law and Policy
  • Villanova University, Bachelor of Mechanical Engineering, cum laude

  • District of Columbia
  • Virginia
  • Registered to practice before the United States Patent and Trademark Office
  • U.S. Court of Appeals for the Federal Circuit

  • American Bar Association
  • American Intellectual Property Law Association
  • International Trademark Association (INTA)
  • ITC Trial Lawyers Association
News & Insights

Evan H. Langdon Participates in a AIPLA ITC Committee Panel Teleconference on Ground Rules at the ITC

On June 25, 2015, Evan will participate in a panel teleconference hosted by the AIPLA ITC Committee.

In The Legal Pulse: "Supreme Court Observations: Alice Corp. v. CLS Bank"

On June 25, 2014, Evan and Dan published guest commentary on The Legal Pulse, Washington Legal Foundation’s blog, regarding the recent Supreme Court ruling in Alice Corp. v. CLS Bank .

In IP Law 360: "ITC Gets Creative to Limit NPE Access Under Section 337"

Tom M. Schaumberg and Evan H. Langdon recently published an article for IP Law 360 entitled “ITC Gets Creative to Limit NPE Access Under Section 337.”