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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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Biogen v. Amgen (D. Mass.)

Patent Litigation

Biogen / Harvard v. Pharmacia (D. Mass.)

Patent Litigation

Chiron v. Vertex/Lilly (N.D. Cal.)

Patent Litigation

PPG v. Celanese (E.D. Pa.)

Patent Litigation

Square D v. 3M (N.D. Ill.)

Patent Litigation

Sheller Globe v. Milsco (D. Wisc.)

Patent Litigation

Schering-Plough v. Sterling Winthrop (D.N.J.)

Patent Litigation

Pieczenik v. Dyax (D. Mass. and S.D.N.Y.)

Patent Litigation

Oregon Health & Sciences University v. Vertex (D. Oregon)

Patent Litigation

Amgen v. Aventis/TKT (D. Mass.)

Patent Litigation

MEEI v. QLT (D. Mass.)

Patent Litigation

Genzyme v. Medicis (D. Mass)

Patent Litigation

Genzme v. Seikagaku and Zimmer (D. Mass)

Patent Litigation

Shelbyzyme v. Genzyme (D. Del.)

Patent Litigation

Genzyme v. Anika Therapeutics (D. Mass.)

Patent Litigation

Antares Pharma, Inc. v. Medac GmbH and Medac Pharma (D. Del.)

Patent Litigation

Medac Pharma, Inc. et al. v. Antares Pharma, Inc. et al. (D.N.J.)

Patent Litigation

Regeneron Pharmaceuticals, Inc. v. Ablexis LLC (S.D.N.Y.)

Patent Litigation

In the Matter of Certain L-Tryptophan, L-Tryptophan Products, And Their Methods of Production (U.S. ITC)

Patent Litigation

Trustees for Dartmouth College / ChromaDex, Inc. v. Elysium Health (D. Del.)

Patent Litigation

Cherokee Gray Eagle IP v. Rockin’ Jump (S.D. Fla)

Patent Litigation

Cherokee Gray Eagle IP v. CircusTrix (M.D. Fla)

Patent Litigation

Cherokee Gray Eagle IP v. Sky Zone (M.D. Fla)

Patent Litigation

Leason Ellis Secures Trademark Registration for Configuration of Dots on Sensor Devices

Trademarks

Computers and Technology

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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
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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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Professionals
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Representative Work Firm Accolades
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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
Copyrights Litigation Patents Trade Secrets Trademarks Transactions
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