Firm Profile > Adduci, Mastriani & Schaumberg, LLP > Washington DC, United States

Adduci, Mastriani & Schaumberg, LLP
United States

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


The renowned international trade boutique Adduci, Mastriani & Schaumberg, LLP in Washington DC offers fourty years of Section 337 expertise. Since its foundation in 1980, the firm has represented a long string of prestigious clients from a broad sector spread, including the key technology, life sciences and consumer products sectors, both as stand-alone counsel or in collaboration with another law firm for the non-ITC aspects of a dispute. The core players in the hugely experienced group include the founding fathers James Adduci, Louis Mastriani and Tom Schaumberg as well as Deanna Tanner Okun, who served two terms as chairman of the International Trade Commission and became managing partner of the firm in January 2020. Lauren Peterson made partner in January 2020. Evan Langdon left for Nixon Peabody LLP in September 2019 and Paul Bartkowski formed Bartkowski PLLC in 2021.


The team at Adduci was very responsive and comprehensive throughout the fast-paced ITC process. They quickly got up to speed on the issues and quickly understood what topics were most critical for us. They kept us involved and informed and made the entire process run incredibly smoothly.

This firm is a small boutique firm which means you don’t get lost in the shuffle or handed off to multiple parties. Trade is a very specialized area and this firm seems to cover any potential specializations within trade. They are knowledgeable helpful and very comfortable to work with.

Outstanding boutique practice. Deanna Tanner Okun has built an outstanding team that makes even medium to smaller size clients feel they are getting the absolute best and immediate attention. The team compliment each other very effectively and there has not been an issue or question where we have not gotten fast, accurate and helpful information in making important decisions. ‘Best in Class’…

AMS has tremendous expertise in International Trade Commission work of all kinds, including Section 337 litigation. It tends to hire former ITC attorneys from staff level departments and the general counsel’s office, and even has the former chairperson of the ITC. They pair well with substantive patent litigation counsel and are skilled at navigating the rules and agency practices that are different from district court litigation.

Tom Schaumberg is a true ‘dean’ of the ITC patent bar with several decades of experience at the agency. He is client-focused and unusually insightful.

Deanna Tanner Okun is especially well-connected with the ITC community, having served as the Chairperson of the ITC for many years before going into private practice. She is experienced, yet creative and keeps her finger on the pulse of ITC practices, which is ever-evolving.

Deanna Tanner Okun is the lead counsel for our interests. She is easy to discuss difficult issues with, I can address any concerns at any time. Deanna takes the broad picture into focus, accounting for every angle in a difficult trade environment! She is a superior practitioner.

Key clients

Denso Corporation

Dynamics, Inc.

Ecolife Technologies, Inc.

HOIST Fitness Systems, Inc.

I4F Licensing NV

InMode Ltd.

LG Chem

Lowe’s Companies, Inc.

MAT Industries

Neodron Ltd.

Nike, Inc.


Qualcomm Incorporated

Technicolor Connected Home USA, LLC

Virtus Pharmaceuticals, LLC

For more than 35 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 Spring 2016, the American Bar Association published the third 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.

Department Name Email Telephone
International trade law V James Adduci II
Section 337 investigations V James Adduci II
Anti-dumping and countervailing duty investigations V James Adduci II
Customs transactions V James Adduci II
Intellectual property litigation V James Adduci II
Number of Partners : 12
Number of Other Fee-Earners : 11
Managing Partner : V James Adduci II
Executive Partners : Louis S Mastriani
Executive Partners : Tom M Schaumberg
Executive Partners : Deanna T Okun