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Cyrus Frelinghuysen focuses his practice on intellectual property and trade matters.  Cyrus has litigated disputes in district courts and before the U.S. International Trade Commission (ITC), having handled numerous investigations under Section 337 of the Tariff Act of 1930.  Cyrus also advises clients on compliance and enforcement matters, including U.S. Customs and Border Protection (CPB), the Office of Foreign Assets Control (OFAC), and the Foreign Corrupt Practices Act (FCPA). He has represented clients across a variety of sectors and technologies, such as telecommunications equipment, mobile devices, semiconductors, and pharmaceuticals.


  • International Trade Commission's Section 337 litigation
  • Patent litigation
  • International trade and compliance



  • Certain Modular LED Display Panel & Components Therof, Inv. No. 337-TA-1114. Represented respondent that was a U.S.-based distributor of LED display panels. The investigation was terminated after the close of fact discovery when the complainant withdrew its complaint.°
  • Certain Graphics Processors, DDR Memory Controllers, & Products Containing the Same, Inv. No. 337-TA-1037. Represented “downstream” respondents in an investigation targeting their suppliers. The investigation was terminated based on a settlement prior to a hearing.°
  • Certain Digital Video Receivers & Hardware & Software Components Thereof, Inv. No. 337-TA-1001. Represented lead respondent in an investigation involving set-top boxes. The ITC’s final determination of violation is pending appeal before the Federal Circuit.°
  • Certain Wireless Standard Compliant Electronic Devices, Including Communication Devices and Tablet Computers, ITC Inv. No. 337-TA-953. Represented complainant in an investigation involving cellular telecommunications technology. The investigation was terminated prior to a hearing on violation.°
  • Certain Electronic Devices, Including Wireless Communication Devices, Computers, Tablet Computers, Digital Media Players, and Cameras, ITC Inv. No. 337-TA-952. Represented complainant in an investigation involving technologies related to critical features of wireless devices. The investigation was terminated following a hearing but prior to issuance of an initial determination.°
  • Certain Nonvolatile Memory Devices and Products Containing Same, ITC Inv. No. 337-TA-909. Represented complainant in an investigation involving nonvolatile memory products. The investigation was terminated after a hearing and just two days prior to the expected issuance of the initial determination.°
  • Certain Flash Memory Chips and Products Containing Same, ITC Inv. No. 337-TA-853. Defended respondents in an investigation involving flash memory products. The investigation was terminated after a hearing but prior to the issuance of an initial determination.°
  • Certain Gemcitabine and Products Containing Same, ITC Inv. No. 337-TA-766. Defended respondent and its China-based supplier in an investigation involving a chemotherapy medication. The investigation was terminated favorably prior to a hearing on violation.°
  • Represented manufacturer of ophthalmic lenses in patent litigation against major competitor. The matter was settled favorably.°
  • Represented major mobile device designer and manufacturer in patent litigation involving patents alleged to be essential to mobile standards. The case was settled.
  • Conducted internal investigation of potential FCPA violations by a multinational corporation with respect to operations worldwide, including China, Hong Kong, Indonesia, Korea, Thailand, Vietnam, and the Philippines.°
  • Prepared numerous OFAC license applications for companies seeking to engage in otherwise prohibited transactions in countries such as Burma, Cuba, Iran, Sudan, and Syria.°
  • Prepared voluntary disclosure materials for submission to OFAC, resulting in issuance of a cautionary letter instead of imposition of monetary penalties.°
  • Pro bono application for hardship exemption for a member of the armed services.°
  • Pro bono application for asylum for a Palestinian woman.°
  • Pro bono petition for the removal of conditions on residence for a victim of domestic violence married to a U.S. citizen.°

°The above representations were handled by Mr. Frelinghuysen prior to his joining Greenberg Traurig, LLP.

Recognition & Leadership

  • Listed, Super Lawyers Magazine, Washington, D.C. Super Lawyers, “Rising Star,” 2014-2018
  • Listed, Capital Pro Bono Honor Roll, 2012
  • Member, American Bar Association
    • Member, International Law Section
    • Member, Intellectual Property Law Section
    • Member, Antitrust Law Section
  • Member, International Trade Commission Trial Lawyers Association
  • Member, American Intellectual Property Law Association
    • Member, AIPLA Quarterly Journal Editorial Board
  • Member, Steering Committee, Young Professionals Network, Mid-Atlantic Innocence Project


  • J.D., Georgetown University Law Center
    • Executive Editor, Georgetown International Environmental Law Review
  • M.A., International Relations and International Economics, Johns Hopkins University, Paul H. Nitze School of Advanced International Studies
  • A.B., Princeton University
  • District of Columbia
  • New York
  • Chinese (Mandarin), Conversational