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Grégoire Desrousseaux

Partner, European Patent Attorney

Grégoire Desrousseaux began his career as a patent attorney before being admitted to the Paris Bar in 2000 and joining August Debouzy as a partner in 2011.

Working in the Technologies, Media, Intellectual Property Department team, he assists French and foreign clients with all patent-related issues in an advisory role, with oppositions before the European Patent Office and in a litigation role. A graduate of Polytechnique and ENST, Grégoire Desrousseaux is a lawyer and an engineer. His dual background, combining technical understanding and legal solutions makes him a real asset to clients.

Grégoire Desrousseaux heads a team of lawyers with similar engineering backgrounds. He contributes to the transmission of knowledge by lecturing in patent law, at CEIPI (Center for International Intellectual Property Studies) and in engineering schools.

Practice Area

  • Patent Law
  • Intellectual Property, Media, and Art Law


Education

  • University of Paris X, Nanterre, Masters in Law, 1994
  • Ecole Polytechnique, 1986
  • Telecoms Paris, 1989


Admitted to the bar

  • Paris, 2000
  • European patent attorney, 1994


Languages

French I English I German

CHAMBERS AND PARTNERS FRANCE 2025
Intellectual Property : Patents : Band 1

CHAMBERS AND PARTNERS GLOBAL 2025
Intellectual Property : Patents : Band 1

LEGAL 500 EMEA 2024
Intellectual property : Patents : Tier 1
Hall of Fame

IAM PATENT 1000 FRANCE 2024
Litigation : Gold (Tier 1/3)
Prosecution
: Bronze (Tier 3/3)
Transactions :
Recommended

WHO'S WHO LEGAL 2023
France – IP – Patents : Thought Leader
IP – Patents : Recommended
France – Life Sciences : Recommended
Life Sciences – Patent Litigation : Recommended


MIP - IP STARS 2024
Patent disputes: Tier 1
Patent star

JUVE PATENT 2024
Leading individuals – Lawyers in patent litigation

DÉCIDEURS STRATÉGIE FINANCE DROIT 2024
INTELLECTUAL PROPERTY
Patent litigation: leading

HEALTHCARE, PHARMACEUTICALS & BIOTECH
Patents: pharma, biotech, and life sciences litigations: leading

BEST LAWYERS 2025
(Recognized in Best Lawyers since 2010)
Intellectual Property Law, Litigation

IAM GLOBAL LEADERS 2024
  • AD Deal

    August Debouzy Advises Menix Group on the Sale of Global D to Naxicap Partners

    The law firm August Debouzy advised the Menix Group on the sale of its subsidiary Global D, specializing in dental implantology, to Naxicap Partners. This strategic transaction aims for significant growth over the next five years through a buy-and-build strategy, industrial innovations, and international expansion. August Debouzy’s multidisciplinary team, led by Étienne Mathey, leveraged its expertise in Corporate, Tax, Employment Law, and IP/IT to support this key deal.

  • AD Article

    Sony Court of Cassation ruling of April 24, 2024: admissibility of infringement claims even for events occurring prior to registration of the assignment.

    Registration of the assignment in the National Patent Register (NPR) enables the assignee of a patent to enforce the assigned patent against third parties

  • AD Article

    Programme de rémunération supplémentaire porté à la connaissance du salarié : condition suffisante mais pas nécessaire pour mettre en route la prescription de l’action en rémunération supplémentaire de l’inventeur salarié

    Un programme de rémunération supplémentaire porté à la connaissance du salarié : une condition suffisante mais pas nécessaire à la mise en route de la prescription de l’action en rémunération supplémentaire de l’inventeur salarié. Par un arrêt du 1er avril 2022, la Cour d’appel de Paris confirme l’application des règles de prescription de l’action en rémunération supplémentaire des inventeurs salariés découlant de la réforme de la prescription de 2008 : le délai de prescription triennal court à partir du moment où le salarié avait connaissance des faits lui permettant d’exercer l’action.

  • AD Article

    1st date of proceeding before the Paris Court of Justice: 60 days after the service of summons, even for foreign defendants

    The Economic and Commercial Activity Department of the 1st instance court of Paris has modified its website. Thus, even for summonses involving a defendant residing abroad, it is possible to request a date for the orientation hearing within a standard period of 60 days rather than 180. Although it is only published on the page of the Economic and Commercial Activity Department, this clarification should concern all summonses subject to the obligation to take of the date of orientation hearing.

  • AD Article

    San-Ei v. Nexira on the abuse of the right to sue for infringement: an isolated case or the beginning of a disturbing case law for right holders?

    the abuse of the right to sue for infringement : When it comes to infringement proceedings, it is common for the defendant to counterclaim for abuse of process, and equally common for the defendant to be dismissed. The dismissal of such claims is usually based on the grounds that the plaintiff may be mistaken about the scope of his rights and that the mere bringing of such action is not abusive per se.

  • AD Article

    FRAND licences: the Paris Court of First Instance confirms its jurisdiction

    Two decisions of 7 December 2021 in the same case (i) confirm the jurisdiction of the Paris Court of First Instance to hear claims relating to the determination of a FRAND rate at the global level and (ii) recognise ETSI's standing to defend in this type of dispute. The case opposes Xiaomi against Philips and ETSI.

  • AD Article

    Recours en restauration : la Cour de cassation impose à l’INPI d’harmoniser sa pratique avec celle de l’OEB

    Dans un arrêt du 1er décembre, la Cour de cassation a annulé une décision du directeur général de l’INPI déclarant un recours en restauration irrecevable comme tardif. Elle retient une nouvelle interprétation du délai d’un an pour former un recours en restauration des droits à présenter une requête en poursuite de la procédure. Cette interprétation aligne la pratique de l’INPI sur celle de l’OEB.

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    An order of the Paris Court of justice of 25 June 2021[1] confirms the rules governing the application over time of the successive provisions on statute of limitations for claims for additional remuneration of employees' inventions (1). In this decision, and in an earlier decision of December 2020[2], the Court also recalls the rules for assessing the starting point of the limitation period in concreto (2).

  • AD Article

    Application of PACTE law provisions on the statute of limitations for infringement actions: a welcomed clarification

    An order from Paris Judicial Court dated May 6, 2021 has clarified how to compute the statute of limitations for infringement actions further to the PACTE Law’s entry into force. The PACTE Law introduces two changes to the statute of limitations for infringement actions: the starting point of the limitation period becomes subjective, since it is necessary to consider the moment when the plaintiff in the action "knew or should have known" the offending fact, in accordance with the general regime of article 2224 of the Civil Code ; but the statute further specifies that it is "the last fact" upon which the action is based which must be considered. These changes became effective on May 24, 2019. The order of May 6, 2021 recalls the jurisprudence of the Court of Cassation according to which the new law cannot have the effect of modifying the starting point of the limitation period which began to run under the old law. Thus, acts of infringement that occurred before May 24, 2019 remain subject to a five-year statute of limitations that runs from the time the act was committed. In other words, the PACTE law will not have any practical effect before May 24, 2024. It is only from this date that the court will be able to fully apply the provisions relating to the starting point of the limitation period set out in article L.615-8 of the French Intellectual Property Code as amended by PACTE Law.

  • AD Article

    Les Ateliers du brevet – édition 2020

    Pour la troisième année consécutive, Grégoire Desrousseaux, François Pochart et leur équipe de mandataires européens et d’avocats, ont proposé quatre Ateliers du Brevet pour aborder des solutions pratiques aux problèmes quotidiens des professionnels des brevets.

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