Marcel van Kooij

Marcel van Kooij PhD

Patent Attorney



Arnold + Siedsma Netherlands

Rembrandt Tower, 28th floor

Amstelplein 1
4196 HA Amsterdam

Tel: +31 20 6444000 (Patents)

Tel: +31 20 3331433 (Attorneys at Law)

Tel: +31 20 3013500 (Trademarks & Designs)




Marcel is skilled in the many aspects of providing patent services, such as writing and prosecuting patent applications, defending patent applications before the European Patent Office (opposition and appeal), nullification of patents of possible competitors before the European Patent Office, the Patent Centre and in court, advising clients on the development or strengthening of their IP position, negotiations concerning licences or transfer, second opinions and additional IP protection, such as SPCs and plantbreeders’ rights.


Marcel advises and supports many large national and international clients on their IP and innovation policy but is also involved in start-ups, particularly in the field of biotechnology.


In addition to his role as expert in the field of patent law, Marcel has specialized as proactive adviser whose main concerns are custom service, cost control and creativity combined with a long-term vision.


Marcel approaches a case with a pragmatic attitude which gives priority to clarity and transparency for the client. The starting point in a case has to be that one (the expertise of the client) plus one (the expertise of Marcel) equals three.