All team members


Dr Derk Vos


German Patent Attorney

European Patent Attorney


Derk Vos specializes in the fields of chemistry and pharmaceuticals, with particular emphasis on medicinal products (e.g. small molecules), plant protection agents, lubricants and chemical processes.

Derk provides counselling on patent portfolio strategies and portfolio management across a wide range of IP-related matters including validity, infringement and nullity proceedings, supplementary protection certificates, due diligence and freedom-to-operate. He drafts patent applications and oversees patent prosecution worldwide. He has successfully conducted numerous opposition and appeal proceedings before the EPO, including petition for review proceedings before the Enlarged Board of Appeal. He has been involved in and coordinated national and international nullity and infringement proceedings, particularly in the areas of pharmaceuticals and diagnostics.

since 2009
Partner, shareholder and managing director at Maiwald
since 2007
Patent attorney at Maiwald
2004 - 2007
Patent attorney trainee at Maiwald
2000 - 2004
Management consultant at an international strategy consulting company with projects in Germany, the USA and Sweden

Admitted to practice as European patent attorney
Admitted to practice as German patent attorney
2004 - 2006
Studied law for patent attorneys at the University of Hagen
1997 - 2000
Doctoral degree in the field of organometallic chemistry from Bielefeld University
1991 - 1997
Studied chemistry at Bielefeld University and the University of Utah

  • Opposition, appeal and nullity proceedings
  • Supplementary protection certificates proceedings
  • Freedom-to-operate and validity analysis
  • Patent prosecution and portfolio management
  • Filing strategies and drafting patent applications
  • Patent litigation

  • Recommended in MIP IP Stars 2021
  • Recommended in Legal 500 Deutschland 2021, 2022
  • Recommended in Handelsblatt | Best Lawyers "Germany's Best Lawyers" 2020, 2021
  • Recommended in IAM Patent 1000 “World’s Leading Patent Professionals” 2020
  • Recommended in WirtschaftsWoche 2015
  • Scholarship of the “Studienstiftung des Deutschen Volkes”
  • Scholarship of the Chemical Industry Fund

  • Schutzzertifikat widerrufen, 2020
  • The pitfalls of Article 123(2) EPC – Recent Case Law of the Boards of Appeal, invited lecture at Basel Intellectual Property Lectures, 2012

  • High barrier set for revocation of injunctions, 2012
  • The EPO’s approach to disclaimers, Managing Intellectual Property – Europe IP Focus 2010

  • Towards a new novelty definition for chemical structures, Managing Intellectual Property, 2009

  • ECJ to rule on SPC dates, Managing Intellectual Property, 2008

  • EBA rules on validity of divisional applications, Managing Intellectual Property, 2007

  • German Patent Attorney Association
  • epi
  • GDCh

  • German
  • English