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Gwennhaël Le Roy

Associé / Paris

Conseil en Propriété Industrielle Brevets

Mandataire agréé près l’OEB

Assistante : Valérie Daoud


  • - Post-graduate degree in Industrial Property Law (Strasbourg University) – 2004
  • - Graduate degree in Chemical Engineering of Ecole Européenne de Chimie, Polymères et Matériaux (Strasbourg) - 2003

Practice description

Gwennhaël began his career with CASALONGA & ASSOCIÉS in 2004 and became partner in 2015.

Gwennhaël focuses on drafting and prosecuting both domestic and foreign patent applications. He also gives opinions on freedom to operate, studies the validity of patent claims.

He also regularly represents clients in patent application proceedings before the European Patent Office, including opposition and appeal proceedings.

He also has experience of patent litigation.

Gwennhaël represents a wide range of clients ranging from small start-ups and laboratories to multinational corporations in the fields of organic chemistry, cosmetics, chemistry and physics of materials, synthesis and characterization of polymers, sol-gel processes, colloids, pharmaceutical.

Professional organizations

Gwennhaël Le Roy is member of the French Patent and Trademark association (CNCPI “Compagnie Nationale des Conseils en Propriété Industrielle”) and the European Patent Institute (epi).


French, English, German