Patent Litigation

Many of the world’s premier companies rely on Weil’s patent litigation expertise to navigate the ever-changing patent landscape. Our lawyers are at the forefront of major representations that are transforming the technology and life sciences industries.

Notable Representations, Key Contacts

Patent Litigation

Our litigators have a great track record in patent cases across all the major venues in the United States. We effectively advance our clients’ objectives, whether those are winning a dispute in court or negotiating an advantageous license. Our team provides clients with experience across multiple sectors, including semiconductors, high tech, telecom, pharmaceutical and biotechnology therapeutics, biotechnology research tools, medical devices, chemicals, manufacturing, and consumer products.

Integrated, Full-Service Patent Dispute Practice

Attorneys in the Patent Litigation group have extensive experience litigating and trying cases in all the major patent venues. We understand the landscape in each court and tribunal; this deep knowledge gives our clients a strategic advantage in high-stakes proceedings. Our patent litigators regularly represent clients in:

  • U.S. District Courts: Our litigators have extensive experience, and have achieved significant wins, in the District of Delaware, the Eastern District of Texas, the Northern and Central Districts of California, the Eastern District of Virginia, the District of New Jersey, and others.
  • Federal Circuit Court of Appeals: Clients rely on Weil’s patent appeals practice for its experience, acumen, and ability to deliver win after win in the Federal Circuit.
  • U.S. International Trade Commission: Our lawyers regularly represent clients in high-stakes investigations under the ITC’s fast-paced procedures.
  • Patent Trial and Appeal Board: We regularly work with clients on challenges to the validity of patents at the PTAB, in Inter Partes Review (IPR), Post-Grant Review, and Covered Business Method Review proceedings, both as Patent Owners and Petitioners.
  • IP Due Diligence: We offer a multidisciplinary Strategic IP Counseling group that focuses on patent portfolio analysis, pre-dispute counseling and investigations, and IP transactions.

The Team’s Technical Depth

Recognized as a go-to firm for high-stakes patent litigation, we offer a deep bench of litigators with diverse technical and scientific backgrounds, including graduate and undergraduate degrees in: electrical engineering, physics, mechanical engineering, computer science, chemistry, biochemistry, molecular biology, and cell biology.

“[Weil] has been handling high-stakes patent litigation since before this became fashionable – years of experience give its lawyers a natural feel for how judges in different venues might respond to various arguments and approaches.”

IAM Patent 1000

Selected Representations

Bio-Rad Laboratories and the University of Chicago

HP Inc.




General Electric

Key Contacts

Brian E. Ferguson

Brian E. Ferguson


Washington, D.C.

Edward R. Reines

Edward R. Reines


Silicon Valley

Elizabeth Weiswasser

Elizabeth S. Weiswasser


New York

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Recent Announcements

Intellectual Property Firm of the Year

Benchmark Litigation 2017 and 2018

Clients consider Weil “a go-to firm with effective execution and efficient work,” and note: “They’re superb in their client service and are an incredibly organized team. They’re on top of the large matters and they make sure the trains run on time.”

Chambers USA 2015-2019

Ranked among the top 10 firms nationally for Patents: Litigation.

Legal 500 US 2020

Weil “combines wide-ranging technology expertise… with longstanding experience in life sciences and pharmaceutical litigation… and [a] proven PTAB and Federal Circuit strength.”

Legal 500 US 2020

“The team at Weil, Gotshal & Manges LLP 'fights aggressively, but reasonably', 'communicates effectively' and 'makes sure to engage the client on strategic approaches'.”

Legal 500 US 2019

Ranked among the leading firms nationally for Patent Contentious and PTAB Litigation.

Managing Intellectual Property 2020

Ranked among the leading firms for Intellectual Property, Nationwide, California and Texas

Chambers USA 2020

Clients say Weil is “a go-to firm” with “extraordinary lawyers producing top-notch work product" who are “smart, hard-working and meticulous” and “able to work at a high level on strategy and are always thinking five steps ahead."

Chambers USA 2020

Ranked among the leading firms in the U.S. for Intellectual Property: Patent.

Chambers Global 2020

Top 10 firm in the PTAB

Docket Navigator 2018

Awards and Recognition, Speaking Engagements, Latest Thinking, Firm News & Announcements, Recent Announcements

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