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The team at CMS Francis Lefebvre Avocats can assist you with your patent law issues. Our team of lawyers based in Paris is well experienced in the following fields: 

Litigation: Saisie-contrefaçons” counterfeit seizures, Infringement actions, in particular in summary proceedings, unfair competition and parasitism, disputes related to trade secrets, Actions for patent/SPC invalidation or declaration of non-infringement and Litigation related to employee inventions.

Advice and drafting contracts: R&D contracts, relationships with inventors, Filing strategy, portfolio audit, valuation, technology transfer, Assignment, licensing or co-ownership agreements.

Most of the matters have cross-border aspects and require close coordination with actions carried out abroad.

Our team is used to working in several technical fields, in particular in the pharmaceutical and health products fields (also has good knowledge of the regulatory framework applicable to these products), but also in the fields of electronics, mechanics or consumer products. 

This experience  complements an excellent knowledge of other complex disputes such as trade secrets infringement (particularly technical know-how) or unfair competition and/or parasitism

Our team is part of the CMS network of over 150 lawyers, legal experts and specialists advisors in 33 countries. It allows us to propose a global strategy in adequacy with the needs of our customers. This particular  know-how is set to become more importantwith the arrival of the Unified Patent Court and the Unitary Patent.

Quotes 2023

The Legal 500

Intellectual propety : patents

With a particular focus on the life sciences, electronics and mechanics sectors, CMS Francis Lefebvre frequently handles patent infringement litigation and associated claims for damages, as well as assisting in disputes between employers and employees in relation to the ownership of patents. The team around practice head Jean-Baptiste Thiénot also handles research and development contracts, assignment and licence agreements and portfolio audits. Anne-Laure Villedieu, who focuses on data privacy matters, heads the firm’s IP department.

Learn more about Unified Patent Court (UPC) 

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Better Together? Patents on Combination Therapies at the EPO

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Mandatory description amendments at the European Patent Office (G1/25): “Let’s start at the very beginning, a very good place to start”

16 Jan 2026 7 min read

Positive and negative pointers in clinical trial prior art: diverging inventive step outcomes at the EPO and UPC

08 Jan 2026 13 min read

Antibody patents in Europe – an alternative isn’t enough

09 Oct 2025 8 min read

A phase III clinical trial protocol does not by itself provide a reasonable expectation of success of the investigated treatment (T 122/23)

20 Aug 2025 15 min read

Munich regional court cuts British courts' interim FRAND licence “imperialism”

24 Jul 2025 8 min read

CMS Expert Guide on Preliminary Injunctions in IP

16 Jul 2025 2 min read

Events

  • France
    08 Apr 2026

    CMS at Fordham IP & Policy Conference

  • France
    21 Apr 2026

    On the Pulse webinar series 2026 - Spring/Summer

  • France
    28 Apr 2026

    IP Insights webinar series 2026

  • France
    02 May 2026

    CMS at INTA 2026

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