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Maarten Ketelaars

Maarten Ketelaars

Partner & Dutch and European patent attorney
I have worked for NLO since 1997 and have been a Dutch and European patent attorney since 2000. My team and I work for businesses active in mechanical engineering, electrical engineering and physics, with a focus on medical technology and energy. On many occasions, we work together with one or more of the other NLO teams.


  • Computers/Software
  • Electrical Engineering
  • Energy
  • Physics
  • Medical Technology
  • Optics
  • Telecommunications
  • Mechanical Engineering

In addition to working for clients, I also spent 8 years as a tutor at the Dutch training institute for patent attorneys (SBO). From 2007 to 2015 I was a member of NLO's management team, gaining experience of the day-to-day running of a business. I am currently a substitute member of the Dutch delegation to the epi Council and the Dutch representative on epi’s European Patent Practice Committee (EPPC).

Recently switching from a management position to a fully client-focused role, the commercially on-point Maarten Ketelaars specialises in medical devices and alternative energy resources.
IAM Patent 1000 - edition 2017

Over the many years in which I have enjoyed working on patents, I have gained experience in a wide range of technical fields, including electrical engineering, energy, telecommunications, medical technology, signal processing, physics and computer-related inventions (software) for many different SME businesses and research institutes.

Weather (and my work) permitting, I enjoy viewing the world – and gaining a totally different perspective – from a glider.


  •  MSc in Electrical Engineering, Eindhoven University of Technology