Adduci, Mastriani & Schaumberg LLP

Evan H. Langdon

Evan H. Langdon
t: 202-467-6300
f: 202-466-2006
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  • American Bar Association
  • American Intellectual Property Law Association
  • ITC Trial Lawyers Association


  • 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


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

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."

Adduci, Mastriani & Schaumberg, L.L.P. is a Washington D.C. law firm and internationally recognized leader in the field of international trade law with an emphasis on Section 337 intellectual property litigation before the United States International Trade Commission (ITC).  Founded in 1981, the firm has over 30 years of experience practicing before the ITC, all other federal agencies involved in international trade, the United States Court of International Trade, and federal district and appellate courts.  As part of its Section 337 practice, the firm has participated in approximately one-third of all investigations instituted in the last ten years.  In other areas of international trade law, the firm represents clients in antidumping and countervailing duty proceedings, as well as advises clients on Customs valuation and classification, and on country of origin, duty preference programs, sanctions, and export control issues. The firm also advises clients on trade policy issues, including import and export opportunities and barriers, enforcement, and regulatory hurdles.  In addition to its international trade practice, the firm represents clients in a broad range of intellectual property disputes and counsels them on licensing and enforcement.

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