AMS Trade LLP > Washington DC, United States > Firm Profile

United States

Intellectual property > Patents: litigation (International Trade Commission) Tier 1

The distinguished ITC powerhouse changed its brand to AMS Trade LLP in January 2022, following the departure of founding partner Tom Schaumberg. The firm is renowned for its outstanding track record and exceptional ‘in-depth expertise’ in ITC investigations, hailed by some as ‘goto-law firm for Section 337 investigations’. The sizable Washington DC-based practice comprises some of the market’s most experienced names, including founding partner Louis Mastriani and managing partner Deanna Tanner Okun, who served two terms as chairman of the International Trade Commission. Regularly acting for plaintiffs and defendants and operating both as stand-alone counsel or in collaboration with other firms, the group represents clients from a wide variety of sectors, mainly technology, life sciences and consumer products. The practice is further strengthened by a ‘highly competent’ second line of experts composed of partners Lauren Peterson and Daniel Smith. Paul Bartkowski left in January 2021.

Other key lawyers:


‘Compared with other law firms working on 337 cases, the firm is the most experienced and efficient one.’

‘Since 337 investigations often involve complex technology, lawyers need to work with experts and law firms with different background. AMS lawyers are very cooperative with various teams that we worked together. More importantly, AMS charges reasonably.’

They are the go-to-law firm for Section 337 investigations, having been directly involved in almost one-third of all Section 337 cases filed before the International Trade Commission.’

I have worked directly with Deanna Okun, Daniel Smith, and Lauren Peterson and found each of them to be highly competent and great to work with.’

Great team with in-depth expertise on ITC litigation.’

Key clients





Fujian Fran Optics


LG Chem

Motion Picture Association



The NOCO Company


Work highlights

  • Along with Vorys, Sater, Seymour and Pease, representing complainant NOCO in a patent and trade mark Section 337 action regarding portable lithium ion battery jump starters.

International Trade > International trade

Formerly known as Adduci, Mastriani & Schaumberg, the strategic importance of international trade work to AMS Trade LLP's firm-wide offering has been increasingly evident over recent years. It notably confirmed its commitment to the area with the 2022 appointment of trade remedies and Section 337 expert Deanna Tanner-Okun as managing partner, as well as its rebranding.

For 40 years, Adduci, Mastriani & Schaumberg, LLP has provided thorough, expert counsel to meet clients’ unique legal needs in the fields of international trade, intellectual property litigation and customs transactions. The firm specializes in pursuing clients’ legal actions effectively and efficiently before federal regulatory agencies and tribunals, including the US International Trade Commission (ITC), US Department of Commerce (DOC), Federal Courts, and US Customs and Border Protection (Customs). Many of the firm’s attorneys have worked as legal counsel or advisors to one or more of these government agencies, facilitating the maintenance of good working relations with these offices. Extensive experience in litigating import-related intellectual property, anti-dumping, countervailing duty and customs cases enables the firm to handle its clients’ international trade concerns rapidly and at a reasonable cost.

Main areas of practice
Section 337 investigations: the firm’s most recognized expertise is in litigating Section 337 cases. In fact, it has been involved in nearly one third of the 1,000+ Section 337 investigations that have been filed before the ITC. The firm’s attorneys have both served as legal counsel to the ITC and helped revise its statutes, rules and procedures, adding to their familiarity with the process. The firm has represented complainants as well as respondents, thus providing its clients with the benefit of highly effective legal strategies and guidance regardless of their role in a particular case. In addition, the firm has been involved with a wide range of products, including semiconductors, ink cartridges, footwear, pharmaceutical compositions, ceramic capacitors, and automotive parts. In 2019, the American Bar Association published the fourth edition of the firm’s book, entitled A Lawyer’s Guide to Section 337 Investigations Before the U.S. International Trade Commission.

Anti-dumping and countervailing duty investigations: the firm has been active in anti-dumping cases since the early 1980s. It has represented domestic and foreign clients in various anti-dumping and countervailing duty investigations before the DOC, the ITC and in appeals before the US Court of International Trade in cases involving such varied products as outboard motors, flat panel displays and aramid fiber. Certain attorneys are NAFTA binational panelists and have been involved in reviews of high-profile anti-dumping and countervailing duty cases.

Customs transactions: effectively guiding importers through the maze of Customs regulations is an integral part of the firm’s international trade practice. The firm’s Washington, DC location allows attorneys to act quickly and effectively at the headquarters level to resolve the varied difficulties clients may face. The firm’s attorneys have significant experience in successfully representing clients in customs matters before the US Court of International Trade and the US Court of Appeals for the Federal Circuit.

Intellectual property litigation: the firm has extensive experience in Federal Court litigation, appellate practice and arbitration. Its cases have involved disputes regarding patents, trademarks, trade secrets and copyright. In addition to litigating intellectual property and unfair competition cases, the firm also represents clients in general commercial and business regulation disputes.

Main Office Adduci Mastriani & Schaumberg LLP202-467-6300
Number of Partners : 10
Number of Other Fee-Earners : 8
English (fluent)
Managing Partner : Deanna Tanner Okun
Executive Partners : Louis S Mastriani
Executive Partners : Tom M Schaumberg
Executive Partners : V James Adduci II