We specialise in intellectual property rights. From the definition of patents to the registration and protection of brands, models, and other rights. We help you make a success of your idea or invention.


Arnold & Siedsma is an all-round service provider for the protection of intellectual property (IP). We have over 140 specialized employees based in several offices in the Netherlands, Belgium and Germany and we are committed to looking after the interests of both national and international clients. More than 55 expert patent attorneys, experienced IP lawyers, trademark attorneys and design attorneys are ready to assist clients in IP matters.Arnold & Siedsma differs from other IP firms by handling both prosecution and litigation. As one of the few European firms employing IP lawyers, patent, trademark and design attorneys, our firm has an exceptionally long track record in offering the full scope of IP services. Our multi-disciplinary UPC desk is at the forefront of breaking new ground in patent litigation, advising and assisting on all matters relating to the Unitary Patent and the Unified Patent Court.

Visit our website

Breaking new grounds in patent litigation and validation

The Unified Patent Court (UPC) and the Unitary Patent (UP) have created new opportunities and challenges for patent litigation and validation strategies in Europe. The new Unitary Patent system currently coexists with European and national patent systems. This new situation requires knowledge of the specifics of both the new and existing patent systems, experienced legal and technical analysis, international litigation skills and the ability to work closely with clients to take new steps in patent litigation. Our UPC desk has the knowledgde and expertise to lead a successful and timely UPC case (litigation, advice or filing re UP) for your company.


Rembrandt TowerAmstelplein 11096 HA AmsterdamPostbus 717201008 DE Amsterdam

+31 20 333 14 33


The European Patent Litigators Network is a group of leading patent law firms from across Europe. Our collaborative approach means we offer an effective solution to Unified Patent Court (“UPC”) litigation.


As a pan-European network our members are able to offer local, scalable solutions to your litigation needs before the UPC.