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Graphic of a grey and white triangle


Allen & Overy’s top tier patent litigation team acts for the world’s leading companies in the most complex patent disputes.

A&O acts in multi-jurisdictional and national patent disputes across a range of sectors, particularly specialising in life sciences and technology. We represent clients in the many different courts and tribunals worldwide, leveraging the full range of dispute resolution methods to deliver commercial outcomes for clients.

We advise on the most significant and complex cases, including advising on some of the first disputes examining Standard Essential Patents and FRAND terms. We have also advised on cases involving Supplementary Protection Certificates and Second Medical Use.

A firm technical understanding is crucial to success. Many of our team members have technical backgrounds and industry experience and can advise with confidence in cases involving the most complex technologies.

Our experience

Eli Lilly

Eli Lilly

in the defence of its patent on Cialis for the treatment of erectile dysfunction. 



in its French litigation adverse to Technicolor’s licensing arm on patents concerning 4G, video coding, and various smartphone features.

A multinational pharmaceutical company

A multinational pharmaceutical company

in the complex enforcement of a patent relating to a valuable medicinal product. The patent covers the second medical use of a known active substance and the proper interpretation of patent claims is crucial to managing this litigation in Poland.

News and insights

Six large cells and three small cells

Blog Post: 20 June 2022

Breaking: Global COVID-19 IPR waiver approved

Last Friday 17 June 2022, the WTO member states came to an agreement on the long negotiated TRIPS Waiver. In its annual 6 days conference (the Ministerial Conference), the WTO member states agreed…

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News: 17 June 2022

Allen & Overy Lawyers named 2022 Managing Intellectual Property IP Stars

Managing Intellectual Property’s (Managing IP) has selected 19 Allen & Overy lawyers for its IP Stars (2022) guide. The publication is the leading specialist guide to IP law firms and practitioners…

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Scientist using a microscopic lens

Publications: 10 June 2022

Webinar: Creating cross-border value with patent term extensions and supplementary protection certificates

The selection of a patent for Patent Term Extension (PTE) or Supplementary Protection Certification (SPC) exclusivities is a critical decision for new drug products.

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Multiple test tubes and dropper

Blog Post: 03 May 2022

Potential compromise on COVID-19 IPR waiver: deadlock resolved?

Last month, a leaked document regarding the TRIPS Waiver revealed a breakthrough between the EU, South Africa, India and the United States. After 18 months of negotiations, the four parties now have…

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Awards and accolades

  • Winner: IP Firm of the Year: Biologics/Biosimilars and IP Firm of the Year: Biotech, LMG European Life Sciences Awards 2020
  • Winner: European Patent Litigation Firm of the Year, MIP EMEA Awards 2019


Recognition of our work

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