close icon-linkedin icon-twitter icon-facebook icon-mail icon-google-plus icon-search icon-phone icon-instagram
What are you looking for?
Maarten Ketelaars

Maarten Ketelaars

Of Counsel
I am an Of Counsel at NLO. I have worked for NLO since 1997 and have been a Dutch and European patent attorney since 2000. My team and I worked for businesses active in mechanical engineering, electrical engineering and physics, with a focus on medical technology and energy. On many occasions, we worked 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 full member of the Dutch delegation to the epi Council and the Dutch representative on epi’s European Patent Practice Committee (EPPC).

Maarten Ketelaars is highly engaged and enthusiastic about his work in a way that is infectious and has an enhanced level of commercial knowledge given his business management experience at the firm.
IAM Patent 1000 - edition 2019

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