Cyril Riffaud

Cyril Riffaud

Senior Associate

Cyril is in our Intellectual property team based in Paris.
His practise focuses on Intellectual Property related matter, in particular in patent litigation thanks to his dual qualifications as a lawyer and an engineer. Graduated from Telecom Paris, Cyril has experience of various domains, including telecommunication, digital signal processing, information and coding theories and computer science.
His practice covers notably the fields of telecommunications, mechanics and energy, and life sciences.
Cyril began his career in a patent attorney law firm, where he built an experience as a patent engineer. His work included drafting patent applications and their prosecution, the establishment of patentability, freedom-to-operate and validity opinions, mainly in the fields of electronics and telecommunications. He also participated in a major telecommunications litigation involving patents essential to GSM, 3G, and 4G standards.


Pro bono

Active participation in the InitiaDROIT project of the Paris bar, which consists in giving courses to secondary and high school students to familiarise them with fundamental legal concepts.

Published Work

  • La semaine juridique, édition générale, 10 September 2018, No. 17, Article “De l’innovation au brevet : l’émergence du droit de propriété » co-authored with David Por.

Leadership Positions And Professional Affiliations

  • Association of European Patent Practitioners (APEB)
  • French Bar association for IP lawyers (AAPI)
  • Licensing Executives Society (LES)


  • “Best Lawyers – Ones to Watch” since 2022
  • Rising star 2024 - Legal 500 EMEA 2024 - France (Intellectual Property: Patents)
  • "David Por and Cyril Riffaud: good at listening to customers, anticipate needs and have a good understanding of files. Moreover, they are friendly." Legal 500 EMEA 2024 - France (Intellectual Property: Patents)



Admitted to the Paris Bar, 2018


Master’s Degree in Economic Law, Sciences Po Law School, Paris, 2013

Master’s Degree, Engineer, Télécom Paris, Institut Polytechnique de Paris, Paris, 2011


French, English
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.