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Representative Work

Results That Speak for Themselves

From complex patent litigation to global trademark strategies, our work spans industries, technologies, and legal challenges of every kind. Here, we share a selection of matters that reflect the creativity, precision, and commercial focus we bring to every engagement.
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Making the World Safe for Fuzzy Babas®

Patent

Consumer Goods

Firm Client AbelZeta Secures $630M Deal for Complete Global Rights to a CAR-T Cell Therapy

Transaction Agreements

Life Sciences and Pharmaceuticals

Michael Davitz’s Patent Expert Report Helps Secure $885M Award in Pay-For-Delay Antitrust Case

Expert Testimony in Complex IP Disputes

Life Sciences and Pharmaceuticals

Obtaining The Trial Quadfectra – Infringement, Damages, Attorney Fee Award, and Injunction

Patent

Industrials and Manufacturing

Successful Defense in a Multi-Patent Case Involving Genetically Modified Plants

Life Sciences

Life Sciences and Pharmaceuticals

Successful Trial Result in a Rare Patent Interference Action

Life Sciences

Life Sciences and Pharmaceuticals

How to Stop a Schedule A Patent Shakedown

Litigation

Consumer Goods

Stopping NPEs in Their Tracks

Litigation

Computers and Technology

CDC Newburgh Inc. v. STM Bags, LLC et al (S.D.N.Y).

Litigation

Consumer Goods

Resolving A New Product Development Deal Gone Bad

Litigation

Consumer Goods

Knocking off a Knock-Off’s Patent Invalidity Action

Litigation

Industrials and Manufacturing

Paving The Way to FTO in Patent Litigation

Litigation

Industrials and Manufacturing

Ameziel, Inc. v. Wiesner Products, Inc., Case 1:20-cv-02095 (S.D.N.Y.) March 9, 2020

Litigation

Consumer Goods

New Trademark Registration Supports Successful Re-filed UDRP

Trademark

Hospitality

Leason Ellis Enforces Nourison's Rights Against Infringing Rug Sellers on Amazon in Declaratory Judgment Action in the Central District of California

Copyright

Consumer Goods

Leason Ellis Enforces Copyright Portfolio for World’s Largest Lace Manufacturer Against Zara in Copyright Infringement Litigation and Secures Favorable Resolution

Copyright

Consumer Goods

Leason Ellis Successfully Opposes Motion by Shein to Enforce Non Binding Settlement and Achieves Favorable Resolution for World’s Largest Lace Manufacturer in Copyright Infringement Litigation

Copyright

Consumer Goods

Leason Ellis Reaches Favorable Resolution in Lanham Act Declaratory Judgment Action in the Eastern District of New York for the Popular Exhibition, Van Gogh: The Immersive Experience

Trademark

Media, Arts, and Entertainment

Leason Ellis Attorney serves as an expert on the management of IP

Expert Testimony in Complex IP Disputes

Consumer Goods

Leason Ellis Leads Worldwide Trademark Enforcement and Anti‑Counterfeiting Initiatives for a Turbocharger Technology Company

Trademark

Industrials and Manufacturing

Leason Ellis Secures Dismissal of All Claims Against Air Purification Technology Company in the Southern District of New York

Trademark

Consumer Goods

Cancellation Settles After Summary Judgment Motion Showing Non-Abandonment of Clothing Trademark

Trademark

Consumer Goods

Leason Ellis Successfully Defended Trademark and Patent Case in Multi-District Dispute

Trademark

Computers and Technology

Thoughtful Motion Practice Leads to Settlement of Trademark Opposition

Trademark

Consumer Goods

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What Others
Say Matters

The voices of our clients, industry peers, and leading legal organizations tell the story of our firm’s impact. Their recognition inspires us to keep raising the bar in client service and results.

  • IP boutique Leason Ellis is one of New York’s very best trademark practices. With tactical finesse, fearless strategy and a collaborative, team-oriented style, the ensemble delivers top-notch brand advice that runs the gamut, from global portfolios to full-scale litigation. In the words of patrons, the trademark and copyright practice group ‘is full of highly trained specialists who hold themselves to a very high standard.'

    WTR 1000, World Trademark Review

  • With a “solid bench of personable attorneys,” Leason Ellis stands out for its blend of sophistication and approachability. The team dives deep into the nuances of trademark law, connecting legal precision with brand strategy. Their sharp eye for detail and collaborative spirit infuse every matter with care and commercial impact.

    WTR 1000, World Trademark Review

  • Leason Ellis is a go-to firm for patent drafting as well as patent litigation. Its practitioners have the ability to understand the strategic importance of patent portfolios from a business perspective, creating significant added value over law outfits that do not look beyond the technical and legal aspects of patents. They have an excellent work ethic, deliver on time every time and genuinely have their clients’ business interests at heart.

    WTR 1000, World Trademark Review (2026)

  • Leason Ellis may be small, but it packs a powerful punch. By prioritising client needs and consistently exceeding expectations, it has become a go-to firm for all patent-related services.

    IAM Patent 1000

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Leason Ellis - Intellectual Property Lawyers Logo in White
Professionals
Tatsuya Adachi Melissa A. Alcantara Elizabeth M. Barnhard Kristin J. Breen Dexter Chang Susie S. Cheng Stacey W. Chung Lori L. Cooper* Ralph J. Crispino M. Diana Danca Michael A. Davitz Edward Ellis* Lauren B. Emerson Joel J. Felber* Matthew L. Frisbee Henry A. Gabathuler Stefanie M. Garibyan Jordan G. Garner Melvin C. Garner Vera Glonina Howard I. Grossman Sara E. Gruber Brian M. Gummow James F. Haley Mitsu Haraguchi Robert M. Isackson Marcus J. Jellen Kendra V. Johnson Cha Hyung (Catherine) Kim David Leason Michelle J. Levin Jia Li Erica S. Livingstone Karen Mangasarian Yuval H. Marcus Elyse Marcus Joshua J. Montgomery Anthony J. Natoli Cameron S. Reuber Emily A. Rice* Maha M. Saber Marlene U. Sauer Karin Segall Peter S. Sloane Audrey E. Trace* Taylor L. Vacala Yilan Wang Jarryd R. Werts
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Copyright Litigation Patent Trade Secret Trademark Transaction
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Professionals
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Representative Work Firm Accolades
Insights
About
Join
Contact
Tatsuya Adachi Melissa A. Alcantara Elizabeth M. Barnhard Kristin J. Breen Dexter Chang Susie S. Cheng Stacey W. Chung Lori L. Cooper* Ralph J. Crispino M. Diana Danca Michael A. Davitz Edward Ellis* Lauren B. Emerson Joel J. Felber* Matthew L. Frisbee Henry A. Gabathuler
Stefanie M. Garibyan Jordan G. Garner Melvin C. Garner Vera Glonina Howard I. Grossman Sara E. Gruber Brian M. Gummow James F. Haley Mitsu Haraguchi Robert M. Isackson Marcus J. Jellen Kendra V. Johnson Cha Hyung (Catherine) Kim David Leason Michelle J. Levin Jia Li
Erica S. Livingstone Karen Mangasarian Yuval H. Marcus Elyse Marcus Joshua J. Montgomery Anthony J. Natoli Cameron S. Reuber Emily A. Rice* Maha M. Saber Marlene U. Sauer Karin Segall Peter S. Sloane Audrey E. Trace* Taylor L. Vacala Yilan Wang Jarryd R. Werts
Copyright Litigation Patent Trade Secret Trademark Transaction
Artificial Intelligence Computers and Technology Consumer Goods Energy
Hospitality Industrials and Manufacturing Life Sciences and Pharmaceuticals Media, Arts, and Entertainment
Medical Devices Professional Services Transportation and Aerospace
China Japan
All Insights News Articles The Newtonian
About Leason Ellis Our Approach Our Culture Pro Bono & Community Engagement
Careers Why Join Us Current Opportunities