Dr. Stefan Féaux de Lacroix

Dr. Stefan Féaux de Lacroix

Patent Attorney
European Patent Attorney
Of Counsel

  • Sectors

  • Languages

    German, English, French
  • Location


Dr Stefan Féaux de Lacroix has been working in the field of intellectual property since 1993. After studying chemistry at the Universities of Bielefeld and Göttingen, followed by a PhD thesis at the MPI for Polymer Research in Mainz, he was trained as a Patent Attorney by Dr. Volker Vossius. He qualified as a German and European Patent Attorney in 1996.

Besides filing and prosecuting patent applications in the fields of chemistry and pharmaceuticals, Stefan Féaux de Lacroix’s professional practice focuses on opposition and appeal proceedings before the European Patent Office and the German Patent and Trademark Office and embraces nullity proceedings, expert opinions on validity/infringement of patents as well as patent litigation support.

He has a wealth of experience in various fields of chemistry (including physical and polymer chemistry) and pharmaceuticals, for example in the production and processing of monomers and polymers, polymer applications, catalysts, chemical processes, photoresists, agrochemicals, OLEDs, 3D printing and active ingredients.

He is the author of several articles on patent law as well as of scientific publications.


  • European Patent Attorney
  • European Trademark and Design Attorney
  • German Patent Attorney
  • Dr. rer. nat.: University of Mainz, Germany: PhD research in Polymer Chemistry at the Max Planck Institute for Polymer Research in Mainz, Germany
  • Dipl.-Chemiker: Diploma (Master) thesis in Physical Chemistry, University of Göttingen, Germany


  • epi Institute of Professional Representatives before the European Patent Office
  • FICPI International Federation of Intellectual Property Attorneys
  • Patentanwaltskammer (Chamber of Patent Attorneys)
  • VPP Association of Intellectual Property Experts


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    Chemical Processes
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    Pharmaceutical Chemistry
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    Physical Chemistry
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September 2020

“Disclaimer – und kein Ende?”, Mitteilungen No. 9

December 2018

“Disclaimer – Decision G 1/16 of the EPO in practice”, VPP-Rundbrief No. 4


“Problematic Open-Ended Claim Language”, Mitteilungen No. 2

September 2009

“EPO – T 1179/07– Second Non-Medical Use”, IP kompakt No. 9, Bundesanzeiger Publisher, Cologne

September 2009

“BGH – Airbag-Releasing Means”, IP kompakt No. 9, Bundesanzeiger Publisher, Cologne


“The relation between limitation, opposition, and nullity proceedings”, Mitteilungen No. 1


“Struggling with inventive step”, JUVE Handbook


“What is a method of operation?”, Mitteilungen No. 1


“Delimination of use claims and process claims”, GRUR No. 11


“When do surprising effects render nonobvious?”, GRUR No. 8


“Reformulation of the Object or the Technical Problem”, VPP Rundbrief No. 4


“Interpretation of Indications of Use in Process Claims – Second Non-Medical Indication”, GRUR No. 4


“Product, Product-by-Process, Process and Use”, Co-Autors: V. Vossius, U. Dörries, Bio/Technology No. 11