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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 & insights

Publications: 14 JULY 2020

Webinar: Beyond Covid-19: Implications for intellectual property

In the second and final webinar in our series, our IP team discusses the future global impact of Covid-19 coronavirus on IP from a transactional, litigation and regulatory perspective.

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Publications: 11 JUNE 2020

Webinar: The key impacts of Covid-19 coronavirus on Intellectual Property

In the first of a series of webinars, Allen & Overy’s IP team addresses the current impact of Covid-19 coronavirus on IP from a transactional, litigation and regulatory perspective.

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Publications: 27 APRIL 2020

Issues brand owners need to consider during the Covid-19 coronavirus pandemic to protect their IP portfolios

Here we assess the difficulties the Covid-19 coronavirus pandemic poses to brand owners involved in trade mark registry proceedings and trade mark litigation, what brand owners can do to mitigate the…

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Publications: 16 APRIL 2020

Mexichem v Honeywell – Will a broad Arrow declaration fly?

An Arrow declaration is a form of discretionary relief granted by UK courts declaring that a product or process would have lacked novelty, or been obvious, at a specific point in time. 

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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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