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Practice Area
Our Patent Litigation Practice is one of the country’s most active and highly regarded. Our seasoned patent litigators bring extensive courtroom experience to every matter we handle. According to Lex Machina, we are among the top three national patent defense firms in the country for number of appearances and cases filed, and we also were the top national defense firm for number of patent trials in the last five years (2018–2022).
Practice Area
We routinely help clients protect and commercialize their intellectual property (IP) assets and provide due diligence on complex technology and IP transactions. We negotiate and draft IP licenses and transfers; provide strategic guidance on optimal structures for IP and IT transactions; and evaluate copyright, trademark, and patent portfolios and provide related due diligence activities in connection with IPOs, mergers and acquisitions, private equity investments, licenses, and other corporate transactions.
Experience 126 results
Experience
|February 4, 2026
A Winston & Strawn deal team led by Partners Justin Levy in New York and Paul Amiss in London advised Aeron Defense, a newly formed defense platform established by Ventus Industrial Partners in partnership with GenNx360 Capital Partners and Admiralty Partners, on its acquisition of defense contracting specialists General Tool Company and Magna Machine Company.
Experience
|February 2, 2026
A Winston & Strawn deal team led by Partners Justin Levy in New York and Paul Amiss in London advised Aeron Defense, a newly formed defense platform established by Ventus Industrial Partners in partnership with GenNx360 Capital Partners and Admiralty Partners, on its acquisition of defense contracting specialists General Tool Company and Magna Machine Company.
Experience
|January 27, 2026
Winston & Strawn secured a decisive victory for PayPal in an intellectual property dispute brought by Irish non-practicing entity Internet Payment Patents LTD (IPPL). Magistrate Judge Susan van Keulen of the Northern District of California entered final judgment in PayPal’s favor, finding all asserted patent claims ineligible under 35 U.S.C. § 101 and granting PayPal’s motion to dismiss without leave to amend.
Insights & News 4,440 results
Webinar
|March 10, 2026
Private Fund Focus on Regulatory Trends, Compliance Practices, & SEC Initiatives
Join Winston & Strawn and the Alternative Investment Management Association (AIMA) for a workshop focused on private fund managers, exploring the regulatory trends and compliance practices in a continuously evolving regulatory environment. Partners Beth Kramer and Scott Naidech, and Five Bells Settlement Corp.’s Chief Legal Officer, Matthew Siano, will discuss current SEC initiatives and compliance practices utilized by private equity funds, hedge funds, and alternative investment fund managers relating to conflicts of interest, fees and expenses, performance marketing, annual review, and SEC areas of focus.
In the Media
|February 20, 2026
|2 Min Read
Patrick Valenti Joins Winston & Strawn in Chicago
Winston & Strawn recently announced that Patrick Valenti has joined the firm’s Chicago office as a partner in the Transactions Department and a member of the Private Investment Funds Practice. Patrick advises private equity sponsors on the formation, fundraising, and operation of private investment funds, with a focus on sponsors raising middle-market private equity funds from $250 million to $3 billion.
In the Media
|February 19, 2026
|2 Min Read
The Chicago Lawyer Showcases Winston’s New Chicago Office
Winston & Strawn Chairman Steve D’Amore and Chicago Office Managing Partner Bill O’Neil were featured in a Chicago Lawyer article highlighting the firm’s new Chicago office at 300 N. LaSalle. Designed to be modern, sustainable, and cutting-edge, the space provides an atmosphere that invites collaboration and creativity, as well as a place to break bread and socialize. A central feature of the new office is a café that serves as a gathering hub with varied seating for attorneys and staff, encouraging conversation. The space transforms weekly into a space for happy hour and informal connection.
Other Results 68 results
Law Glossary
What Is the Patent Trial and Appeal Board?
The Patent Trial and Appeal Board (PTAB) is a tribunal within U.S. Patent and Trademark Office. The PTAB oversees trial proceedings, namely: inter partes review (IPR), post-grant review (PGR), covered business method (CBM) review, and derivation proceedings. The Board also hears appeals from adverse patentability decisions by patent examiners in original applications, reissues, and reexaminations. And, while phasing out since the passage of the America Invents Act (AIA) in 2011, the PTAB is also responsible for deciding interferences. The PTAB was previously referred to as the Board of Patent Appeals and Interferences and was renamed by the AIA.
Site Content
What Is Trademark Infringement?
Trademark infringement is defined as the unauthorized use of a trademark or service mark. This use can be in connection with goods or services and may lead to confusion, deception, or a misunderstanding about the actual company a product or service came from. Trademark owners can take legal action if they believe their marks are being infringed. If infringement of a trademark is proven, a court order can prevent a defendant from using the mark, and the owner may be awarded monetary relief.
Site Content
The United States Patent and Trademark Office refers to a trade secret as a type of intellectual property. This definition of trade secret is in reference to the business ownership of a formula, pattern, compilation, program, device, method, technique, or process that provides a competitive edge. As a member of the World Trade Organization, the U.S. government has a responsibility to protect trade secrets. The passage of the Defend Trade Secrets Act of 2016 (DTSA) also increased trade secret protection. Under the DTSA, an individual or organization may be found liable in a civil case for the misappropriation of trade secrets.