Leo Jessen

Partner at VO Patents & Trademarks

Leo Jessen started his career as a patent attorney in 1992 with VO Patents & Trademarks. He studied industrial design engineering and later law, after passing his patent attorney exams.

Mr Jessen’s clients operate mainly in the field of mechanical engineering. He specialises in consumer products, medical appliances and ergonomics.

Mr Jessen helps clients to define their IP strategy and, where appropriate, file, prosecute and defend their IP rights worldwide. This also includes challenging third-party rights, licensing and conducting freedom-to-operate analysis. Mr Jessen has wide experience in patent cases before the Court in The Hague and the EPO.

Mr Jessen is actively involved in the training of new patent attorneys in Dutch, European and international patent practice. Further, he is chair of the IP enforcement and litigation group of the International Federation of Intellectual Property Attorneys.

Previous testimonials for Mr Jessen include the following:

  • “‘Gifted in both prosecution and litigation’, Leo Jessen is ‘extremely good at building a case’” (IAM Patent 1000, 2019).
  • “Peers praise Leo Jessen as ‘a really excellent, strong attorney who’s been around for many years’. Jessen prosecutes applications for a wide segment of devotees, who depend on his aptitude in filing, oppositions and appeals to keep their stress levels low throughout the patent lifecycle” (IAM Patent 1000, 2018).

Professional associations


Firm details

VO Patents & Trademarks
Carnegieplein 5
The Hague 2517 KJ

Contact details

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