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, tech & comms, 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 by receiving the Client Choice Award for Intellectual Property - Patents in the Netherlands.
  • Dutch biotech emerging growth company: advised on series-B funding by venture technology investors.
  • Energy company: Advised an energy company in the acquisition of certain technology from a multinational in the energy sector and on subsequent IP strategy.
  • Dutch startup: strategically advising on patent and license aspects of vertical pharming.
  • 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 are pending in the Netherlands, the US and before the EPO (both at the Legal Division and in EPO opposition proceedings).
  • US semiconductor company: representing in patent infringement proceedings against an implementer of video coding technology.
  • European company: represented in Standard Essential Patent litigation in the telecom sector.
  • Multinational consumer goods company: Represented and strategically advised a consumer goods company on a dispute in relation to a license on Standard Essential Patents on video coding.
  • Israeli medical device company: Representing and strategically advising on European patent defence and enforcement. This includes representing the company in three EPO opposition proceedings.
  • US life sciences company: representing in various patent infringement actions.


  • 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)
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'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

Douma has "astonishing knowledge of foreign legislation and a great technical understanding that results in solid legal arguments. He is dedicated and has a can-do attitude that makes him a pleasure to work with."

IAM Patent 1000 – Netherlands - 2021

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