Image: Phillip W Citroen

Phillip W Citroen

Of Counsel, Litigation Department
Washington, D.C.
2050 M Street NW
Washington, D.C. 20036
United States

Fax: 1(202) 551-0491


Phillip Citroën is an intellectual property Of Counsel in the Litigation department in the firm's Washington, D.C. office.

Mr. Citroën is a registered patent attorney practicing all aspects of patent-related work, including litigation before U.S. district courts and the U.S. International Trade Commission, post-grant proceedings before the Patent Trial and Appeal Board (PTAB) of the U.S. Patent and Trademark Office (USPTO), appeals, client counseling, and opinions. He also has experience prosecuting patent applications and handling reexamination proceedings before the USPTO. His experience spans a diverse set of technologies, including computer hardware and software, semiconductor devices, Internet and network communications, biotechnology, wireless technologies, digital imaging systems, electronic payment systems, e-commerce, security systems, and business methods. Mr. Citroën has represented petitioners and patent owners in dozens of inter partes review (IPR), covered business method review (CBM), and post-grant review (PGR) proceedings before the PTAB. In many instances, Mr. Citroën's involvement has been coupled with parallel district court litigation. Mr. Citroën's trial experience spans all stages of litigation, including managing fact and expert discovery; taking and defending depositions; preparing various discovery, claim construction, summary judgment, and pre- and post-trial briefs; preparing fact and expert witnesses for trial; oral argument; and participating in settlement negotiations.

Law360 recognized Mr. Citroën as a "Legal Lion" for his work for Google on IPRs where the PTAB invalidated three of Blackberry Ltd.'s patents related to smartphone technology.

Mr. Citroën has also gained valuable experience as in-house patent counsel for a Fortune 500 company that provides information infrastructure solutions.

Accolades and Recognitions

  • Legal Lion, Law360 (2018)


  • George Washington University Law School, J.D., 2010

  • Virginia Tech, B.S., Computer Science, 2007 (cum laude )

Speaking Engagements

  • Speaker, Electronic Discovery - Learn It, Love It, Live It!, AIPLA Annual Meeting, Washington, D.C., October 26, 2018.

  • Speaker, Briefing and Arguing IP Cases, Student Intellectual Property Law Association, The George Washington University Law School, Washington, D.C., January 31, 2018.

  • Quoted, "4 Recent PTAB Decisions Attys Need To Know," Law360, October 22, 2018.

  • Coauthor, "USPTO Proposes Changing Claim Construction Standard for IPRs, PGRs, and CBMs," Lexology, May 10, 2018.

  • Quoted, "PTAB Gives Hope for Patent Amendments Amid Reform Talk," Law360, April 2, 2018.

  • Quoted, "After Lesson in Procedure, Federal Circuit May Mop Up AIA Issues," Law360, February 12, 2018.

  • Coauthor, "Aqua Products: Watershed Decision or Barely a Ripple," Law360, October 16, 2017.

  • Coauthor of various publications for the Federal Circuit Bar Association's Circuit Case Digest .


  • PTAB Bar Association: Vice-Chair, Membership Committee (2018)

  • American Bar Association: Editorial Board, Landslide® magazine (2018)

  • American Intellectual Property Law Association

Recent Representations

  • Representation of various companies, including Google, Samsung, eBay, PayPal, Helsinn, Walgreen, and Mitek in post-grant proceedings before the U.S. Patent and Trademark Office, including inter partes review, covered business method review, post-grant review, and reexamination proceedings.

  • Elm 3DS Innovations, LLC v. Samsung Electronics Co., Ltd. (D. Del.). Representation of Samsung in a patent infringement case and IPRs involving 3D semiconductor technology.

  • Advanced Marketing Systems, LLC v. Walgreen Co. (E.D. Tex.). Representation of Walgreen in a patent infringement case and CBMs involving electronic couponing technology.

  • Rothschild Mobile Imaging Innovations, LLC v. Mitek Systems, Inc. (D. Del.). Representation of Mitek in patent infringement case and IPRs involving software.

  • Certain Digital Media Devices, Including Televisions, Blu-Ray Disc Players, Home Theater Systems, Tablets and Mobile Phones, Components Thereof and Associated Software, 337-TA-882 (ITC). Represented LG in a patent infringement case involving digital media technology and location-based services technology.

  • Audiovisual Components and Products Containing the Same, 337-TA-837 (ITC). Represented Realtek in a patent infringement case involving wireless technology.

  • Bear Creek Technologies, Inc. v. Verizon Services Corp. (E.D. Va.). Represented Verizon in a patent infringement case involving Voice over Internet Protocol (VoIP) technology.

  • Certain Semiconductor Chips and Products Containing the Same, 337-TA-753 (ITC). Represented Rambus in a patent infringement case involving semiconductor devices.

Practice Areas

Patent Office
Patent Litigation
ITC Section 337 Investigations
Intellectual Property




District of Columbia Bar
Massachusetts Bar


The George Washington University Law School, J.D. 2010
Virginia Polytechnic Institute and State University, B.S. 2007