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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

sections of glass and steel layered over each other

Publications: 14 March 2024

Infringing gin part II: Court of Appeal victory for M&S against Aldi’s copycat design

Designers and brand owners will be comforted by Marks & Spencer’s Court of Appeal victory. It reinforces the importance of registering designs to protect against copycat products and, as the first…

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Vertical  perspective of high rise buildings with blue sky background

Publications: 06 March 2024

Shifting Strategies in U.S. Intellectual Property Disputes: Lessons from 2023

For Taiwanese corporates developing critical technologies in the face of shifting global supply chains, the need to protect intellectual property assets has never been more pressing. The biggest…

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A series of columns

Publications: 05 March 2024

Changes in the global patent litigation landscape: The impact of the UPC

The global patent landscape shifted very significantly in June last year, with the opening of the long-awaited European Unified Patent Court (the UPC). This single, one-stop judicial framework…

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formula 1 car at pitstop

Publications: 26 February 2024

No patents, no problem: how Formula 1 technology races ahead without patent protection

As arguably the most technologically advanced sport in the world, where cutting-edge R&D is critical to achieving results on the track, it would be reasonable to assume that patents play a pivotal…

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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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