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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

Person wearing gloves experimenting using petri dish and red liquid

Blog Post: 15 SEPTEMBER 2021

Fibrogen v Akebia: Court of Appeal judgment on sufficiency of functional claims

The Court of Appeal (Birss LJ, Floyd LJ and Phillips LJ) handed down its judgment in Fibrogen v Akebia on 24 August 2021, overturning Arnold LJ (another Court of Appeal judge) on his judgment on…

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Front of car, lights blurring

Publications: 09 JULY 2021

German Federal Constitutional Court paves the way for the UPC

As an international treaty the Agreement on a Unified Patent Court (UPCA) provides for the establishment of the Unified Patent Court (UPC). As a joint Court of the Contracting Member States, the UPC…

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process patents

Publications: 09 JUNE 2021

Process patents – paper tigers or effective protective rights?

Thoughts on “sufficient likelihood” in the sense of section 140c German Patent Act (PatG).

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Allen & Overy graphic

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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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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