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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


Patent attorney trainee at Maiwald


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


Studied law for patent attorneys at the University of Hagen


Doctoral degree in the field of organometallic chemistry from Bielefeld University


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
  • 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
  • SPC revoked, transkript, 04/2020
  • The pitfalls of Article 123(2) EPC - Recent Case Law of the Boards of Appeal, invited lecture at Basel Intellectual Property Lectures, 11/2012
  • High barrier set for revocation of injunctions, Managing Intellectual Property, 02/2012
  • The EPO’s approach to disclaimers, Managing Intellectual Property –Europe IP Focus 2010, 10/2010
  • Towards a new novelty definition for chemical structures, Managing Intellectual Property, 04/2009
  • ECJ to rule on SPC dates, Managing Intellectual Property, 02/2008
  • EBA rules on validity of divisional applications, Managing Intellectual Property, 10/2007
  • German Patent Attorney Association
  • epi
  • GDCh

German, English