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‘Even in doing your day-to-day job, you are likely to invent.’
Harrie Marsman

Harrie Marsman

  • Chemistry
  • European and Dutch Patent Attorney
  • Of counsel

Harrie Marsman started working at V.O. in 1989, where he was a partner up to his retirement in June 2018. Before joining V.O. he studied chemistry at Radboud University Nijmegen. Since July 2018, Harrie has been associated with V.O. as an of-counsel.

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His specialisms are polymer chemistry, food technology, (bio)physical chemistry and inorganic chemistry. Harrie has also gained particular expertise in the formal aspects of the Patent Cooperation Treaty (PCT) and the European Patent Convention,and has considerable experience in dealing with oppositions and attending oral hearings before the European Patent Office. Harrie has experience in patent cases before the court in The Hague.

As a tutor, Harrie assists trainees in the preparation for the European qualification examination (CEIPI). He is also senior lecturer Practical Skills Chemistry for the Dutch qualification examination.

Since July 2007, Harrie had been the financial director of V.O. and he had been responsible for coordinating the training of the trainees and junior associates. He was member of the board of directors of V.O.

Working experience

  • Patent Attorney, V.O. (1989 – June 2018)

Education

  • MSc in Chemistry, Radboud University Nijmegen (1988)

Publications

  • Brinkhof, J.J., Marsman H.A.M. and Murashige K.; Limiting the Risks of Patent Infringement, In: Starting a Business in the Life Sciences; Ed. Henrik Luessen; Editio Cantor Verlag, Aulendorf (2003), pp 158-168

Professional & Community Activities

  • Member of the executive committee of the Foundation for the Dutch Patent Attorney Education (SBO)

Languages

  • English
  • Dutch
  • German
  • French (basic)

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News

UPC Court of Appeal on “same parties” under Article 33(4) UPCA, late claim amendments, and an inventive-step framework: Meril v Edwards (EP 3 646 825)

In its decision of 25 November 2025 concerning EP 3 646 825, the Unified Patent Court (UPC) Court of Appeal addressed procedural coordination between infringement and revocation tracks, the admissibility of sequential amendment requests, and core principles for claim construction and inventive step.Continue reading

Award from Managing IP

On 1 May 1, the British magazine Managing IP once again presented its annual awards in London to IP firms worldwide for their achievements in the field of intellectual property.Continue reading

Herman Witmans and Leo Jessen retire from V.O.

Today, partners Herman Witmans and Leo Jessen retire. This marks the end of impressive careers in which they dedicated themselves with great commitment for 36 and 34 years respectively to clients, colleagues, and the development of the patent attorney profession.Continue reading

Events

AI & IP – Building an IP Strategy for AI Innovation

Keizersberg, Leuven, Belgium

V.O. Patents & Trademarks will take part in Leuven MindGate’s Deep Dive session, AI & IP - Building an IP Strategy for AI Innovation, on 4 June 2026 in Leuven.

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