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Clifford Chance

Clifford Chance
Loïc Lemercier

Loïc Lemercier


Loïc Lemercier

Loïc Lemercier specializes in intellectual property litigation and advisory including patents, SPCs, trademarks, copyright, designs and trade secrets.

Loïc's practice includes initiating and defending preliminary injunction proceedings, seizures for gathering evidence, actions on the merits dealing with validity and/or infringement of the intellectual property rights.

In addition to his litigation work, Loïc also advises his clients on the negotiation and drafting of contracts (e.g. R&D, trademark or patent licensing, pledge agreement) and in the context of M&A transactions, for instance with respect to the due diligence of IP rights and contracts or the negotiation of representations and warranties.

  • R&D

    • Advising aerospace companies on several R&D agreements
    • Advising pharmaceutical companies in compound development agreements
  • Litigation

    • Representing a generic company in numerous patent litigations dealing with validity and infringement
    • Representing a pharmaceutical company in infringement seizure proceedings followed by a main action and preliminary injunction proceedings on a biosimilar formulation patent
    • Representing a pharmaceutical company before the Court of Appeal of Paris against a decision of the French patent and trademark office rejecting an SPC application 
    • Representing a leading provider of specialty in-vitro diagnostic tests, in preparing infringement seizures and in initiating patent infringement actions
    • Coordinating and monitoring parallel proceedings (US, CH and DE) for a pharmaceutical company in order to assess risks and to determine the most relevant strategy to avoid infringement actions 
    • Representing a smartphone manufacturer on defending its freedom to operate against essential/non-essential patent infringement claims (FRAND)
    • Assisting a leading global supplier of automotive seating systems, on patent infringement proceedings
  • IP in M&A and transactions

    • Assisting clients in the pharmaceutical and telecom fields in numerous due diligences
    • Drafting license and/or assignment agreements relating to intellectual property rights
    • Drafting pledge agreements to be entered between bank and technology companies

News and client work

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Contact details

Career and qualifications

  • Paris XII University (Master II in Intellectual Property Law) 2008
  • Admitted as an avocat in Paris 2011
  • Joined Clifford Chance 2019

Professional bodies


Awards and citations

  • Standout practitioner
    Legal 500, France: Intellectual Property – Tier 1, 2019
  • Rising star
    Managing Intellectual Property: IP rising star 2019
  • “(…) Loïc Lemercier also play an important role in the team.”
    Legal 500, Paris: Intellectual Property – Tier 1, 2018