About Me

I am a partner in the Intellectual Property Group based in Amsterdam, with a focus on technology-related matters, in particular patents and trade secrets.

I advise and litigate for clients in the life sciences, technology & communications, energy & utilities and retail and consumer sectors. I have extensive experience in both European and US litigation, including high-end multi-jurisdictional patent disputes.

I have acted for both opponents and patentees as co-counsel in EPO opposition proceedings. I have also represented clients in contractual disputes, including contractual litigation involving milestone claims in the life sciences sector and in arbitration proceedings regarding IP warranties.

I regularly advise clients on IP strategy and on technology-driven M&A deals including in the venture technology field.

My work has been recognised by rankings over the past years in Chambers Global & Europe, Who's Who Legal Patents & Life Sciences, IAM Patent 1000, MIP and in 2020 and 2022 by receiving the Client Choice Award for Intellectual Property - Patents in the Netherlands.
  • US life sciences company: advised on freedom to operate aspects of a digital health solution.
  • Dutch biotech emerging growth company: advised on IP aspects of series-B funding by venture technology investors.
  • Dutch startups: strategically advising on aspects of their own IP position as well as freedom to operate.
  • Energy company: Advised an energy company in the acquisition of certain technology from a multinational in the energy sector and on subsequent IP strategy.
  • US life sciences company: representing in various patent infringement actions in the Netherlands regarding medical devices, as part of a multi-jurisdictional dispute.
  • US semiconductor company: representing in Dutch patent infringement proceedings against an implementer of video coding technology, with invalidity and FRAND defences raised, as part of a multi-jurisdictional dispute.
  • European company: represented in Standard Essential Patent litigation in the telecom sector.
  • Israeli medical device company: Representing and strategically advising on European patent defence and enforcement. This includes (co)representing the company in three EPO opposition proceedings.
  • Dutch innovation company: representing in proceedings regarding claims relation to a patent license agreement in the food and beverage sector.
  • Multinational pharmaceutical company: Representing and strategically advising a pharmaceutical company in multi-jurisdictional patent litigation - involving claims for entitlement, invalidity and infringement - against another pharmaceutical company. Actions were pending in the Netherlands, the US and before the EPO (both at the Legal Division and in EPO opposition proceedings), which resulted in a victory for the client.


  • CASRIP Patent and IP Law Summer Institute on US patent law, University of Washington (2012)
  • Master of Laws, University of Leiden (2008)


  • Dutch bar (2008)
Testimonials Carousel Megaphone


Tjibbe Douma assists clients from the life sciences and technology sectors with patent revocation, opposition and infringement proceedings.
'He is a great problem-solver and strategic thinker.'
'He made good proposals having in mind our needs and what we wanted.'
'He is a first-rate analyst and an excellent litigator.'

Chambers Global, 2023

'Tjibbe Douma certainly stands out. He is an excellent researcher and analyst, not to mention a litigator. He has a great passion for the job and the client and has extraordinary communication skills.''

Legal 500 EMEA, 2022

"Tjibbe Douma routinely undertakes patent litigation and enforcement issues for life sciences clients. His diligence is underlined by clients, one describing him as 'very detailed in his work.' Another client highlights his 'ability to evaluate the legal and business considerations of the client's interests."

Chambers Global, 2021

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