Finnegan, Henderson, Farabow, Garrett & Dunner LLP, commonly known as Finnegan, is an international intellectual property law firm based in Washington, DC, United States. Finnegan was founded on March 1, 1965 by Marc Finnegan and Douglas Henderson in Washington, DC. It is one of the largest law firms focusing exclusively on the practice of intellectual property (IP) law, practicing all aspects of patent, trademark, copyright, and trade secret law, including counseling, prosecution, licensing, and litigation. Finnegan (known as Finnegan Europe LLP in the United Kingdom and the Fei Han Foreign Affairs Law Firm in Taiwan ), also represents clients on IP issues related to U.S. and European patents and trademarks, international trade, portfolio management, the Internet, e-commerce, government