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

Specialist ITC boutique Adduci, Mastriani & Schaumberg, LLP in Washington DC boasts an unparalleled track record in successfully fought ITC investigations. Throughout 2020, the firm has remained the most active adviser at the ITC as Deanna Tanner Okun, a former two-term Chairman of the Commission at the ITC and since January 2020 the firm's managing partner, guided the team and its clients through the challenges caused by the Covid-19 outbreak. With its large team, including founders James AdduciLouis Mastriani and Tom Schaumberg, the firm offers an impressive range of technical expertise, and is also able to assist with trade secrets and trademark ITC matters. The group acts as standalone counsel or in cooperation with other firms in matters involving parallel federal court litigation. Paul Bartkowski left to found Bartkowski PLLC in January 2021. Lauren Peterson and Joshua Hartman, who joined the partnership in January 2020, continue to gain visibility in the market.

Practice head(s):

James Adduci; Louis Mastriani; Tom Schaumberg; Deanna Tanner-Okun

Other key lawyers:

Lauren Peterson; Joshua Hartman; Daniel Smith; Asha Allam; Jonathan Engler; Michael Doman


‘Unrivalled experience at the ITC, including familiarity with judges and judges’ practices.’

‘Timely responses, and ability to do anything from handling substantive aspects of a case to advising on strategy (with relatively little background knowledge required).’

‘Compared with other firms, Adduci, Mastriani & Schaumberg LLP is more experienced. The lawyers, especially Tom Schaumberg, know every rule and practice about the proceeding, and they always provide the most appropriate strategy to address the need of clients.’

‘Tom Schaumberg is very impressive, not only for his rich experience in 337 cases, but also for his passion to work. He always replies questions promptly without any delay, even during holidays. He sets a good example for young professionals how to pursue the legal career.’

‘The firm provides key insights and work product in a timely fashion at an excellent value.’

‘The firm is a very good ITC firm. Very knowledgeable re.: ITC procedures and practice, work well with clients, keep costs in mind.’

‘The team is specialized in ITC litigation, extremely experienced, creative and forward-looking. It is a small and very focused team, which provides a lot of value and expertise to every ITC litigation.’

‘The partner Tom Schaumberg is an extraordinary high qualified ITC litigator, very creative, knowledgable and smart.’

‘The group is extremely knowledgeable about ITC rules, procedures, judges preferences, and particular case law from ITC orders, rulings, and motion decisions. That makes them extremely efficient and also allows them to provide insight that very few firms can. They also work well as a team dividing work effectively among lawyers with varying experience making their work product cost efficient.’

‘It is their complete knowledge of all things ITC that makes them stand out. Because I believe they devote all of their time to ITC matters they are the most knowledgeable group I have come across. I have been particularly impressed with Asha Allam. Particularly her knowledge of the economic prongs that are a required part of section 337 cases.’

Key clients

Anping Shengjia Hardware Mesh Co., Ltd.; and Hebei Hengying Wire Cloth Co., Ltd.

Atlas Roofing Corporation and GAF Corporation

Cisco Systems


Dynamics, Inc.

HyperIce, Inc.

I4F Licensing N.V.

Kyocera Senco Brands

Lashify, Inc.

LG Chem

Neodron Ltd.


Q3 Networking LLC

Qualcomm Incorporated

Technicolor Connected Home USA, LLC

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.

Department Name Email Telephone
Main Office Adduci Mastriani & Schaumberg LLP 202-467-6300
Photo Name Position Profile
 V James Adduci II  photo V James Adduci II Executive Partner
 Asha Allam  photo Asha Allam Partner
 Michael R. Doman, Jr.  photo Michael R. Doman, Jr. Associate
 Jonathan J. Engler  photo Jonathan J. Engler Equity Partner
 Juan J. Garcia  photo Juan J. Garcia Associate
 Catherine S. Gault  photo Catherine S. Gault Associate
 Joshua Hartman photo Joshua Hartman Partner
 David H. Hollander, Jr.  photo David H. Hollander, Jr. Partner
 Louis S. Mastriani  photo Louis S. Mastriani Executive Partner
 John McGrath  photo John McGrath Associate
 Deanna Tanner Okun photo Deanna Tanner Okun Managing Partner
 Hayley M. Ostrin  photo Hayley M. Ostrin Associate
 Lydia C. Pardini  photo Lydia C. Pardini Associate
 Lauren E. Peterson  photo Lauren E. Peterson Partner
 Elizabeth Duall Regard photo Elizabeth Duall Regard Of Counsel
 Tom M. Schaumberg  photo Tom M. Schaumberg Executive Partner
 Daniel F. Smith  photo Daniel F. Smith Partner
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