Dr Derk Vos > Maiwald GmbH > Munich, Germany > Lawyer Profile

Maiwald GmbH

Work Department

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.


German Patent Attorney
European Patent Attorney
Representative before the UPC


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


German, English


  • epi
  • GDCh


2023 Admitted to practice before the UPC
2007 Admitted to practice as European patent attorney
2007 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

Lawyer Rankings

Germany > Intellectual property > Patent litigation: patent lawyers

Maiwald GmbH, with headquarters in Munich, is experienced in disputes, particularly in opposition proceedings before the EPO, but also has expertise in nullity and infringement proceedings. Pharma and chemistry are among the practice’s central specialist areas, which are covered by Eva Ehlich and Derk Vos among others; both are often instructed by US and Japanese clients. Biotechnology, electrical engineering and mechanical engineering form additional practice pillars; Sophie Ertl and Alexander Schmitz are among the key contacts for the latter.

Germany > Intellectual property > Patent prosecution

With a team consisting of solicitors and patent lawyers, Maiwald GmbH is a one-stop patent shop and also provides seamless advice on other IP areas, including trade mark and copyright law. The group’s technical cornerstones include engineering, medical technology, biotechnology as well as chemistry and pharmaceuticals, while its geographical focus rests on the US, China, Switzerland and the United Kingdom. Eva Ehlich (polymer chemistry, drug delivery, formulation technology), Dirk Bühler (drugs, molecular chemistry, biology, diagnostics) and Derk Vos (chemistry and pharmacy) are among the team’s key contacts.