Belgium Netherlands Arnold + Siedsma

Arnold + Siedsma is driven by ideas. We have more than 95 years experience in the legal protection of inventions, trademarks and designs, at home and abroad.

We are an all-round service provider for the protection of intellectual property. We represent clients before the Dutch, Belgian and European patent offices and have over 130 specialised employees based in 11 offices in the Netherlands, Belgium, Germany and Switzerland.

Arnold + Siedsma differentiates itself from other IP firms in that it handles both prosecution and litigation. As one of the few European firms employing IP lawyers, patent attorneys and trademark attorneys, our firm has a long track record in offering the full pallet of IP services.

Our professionals protect and enforce technology, processes, innovative products, trademarks, models and (product) designs, with in-depth knowledge of a broad spectrum of innovative industry sectors.

Our activities involve assessing new innovations, compiling and applying for patent and trademark applications, defending patents and trademarks in infringement cases, and offering strategic and operational IP advice.

Our patent attorneys, trademark and design attorneys and lawyers work closely together. We can establish a multi-disciplinary team for our clients so that issues are communicated between the different disciplines quickly, seamlessly and without unnecessary costs. Arnold + Siedsma is uniquely placed as a service provider in the Netherlands thanks to this team-based approach. Our aim is to ensure that you have maximum legal protection.

We have substantial experience in litigation and opposition proceedings, so we fully understand how decisions are made on IP rights when the need arises. If a client is facing opposition to a patent or trademark, our attorneys and lawyers are pleased to conduct the defence on its behalf. Conversely, if a patent or trademark has been unlawfully granted elsewhere, we will instigate opposition proceedings with the patenting body or invalidity proceedings through the courts to declare the patent or trademark null and void.

Further, we are familiar with drafting agreements between parties that wish to share the use of a patent, trademark or other IP right.

The protection of innovation is of great economic value, but remains a costly business. This is why, at Arnold + Siedsma, we attach great importance to clear communication before, during and after the various procedures and we never lose sight of our clients' commercial interests.

At Arnold + Siedsma, applying for protection is not the ultimate goal. The protection must be effective; only then does it create the required added value. Our patent attorneys also offer an objective opinion on whether to apply for protection.

The lines of communication with our specialists are short and personal. Service is our top priority.

Main address

Bezuidenhoutseweg 57
The Hague 2594 AC

Contact details

T: +31 70 3654833
F: +31 70 3452140

Professional contacts

Paul Hylarides, Managing partner

Other offices

Amsterdam, Antwerp, Breda, Brussels, Eindhoven, Enschede, Leeuwarden, Munich, Nijmegen, Zug

Recommended individuals at this firm

Nele D'Halleweyn

Arjen JW Hooiveld

Maarten Nollen

Joost Grootscholten

Rogier Brouwer

Petri FHM van Someren

Addick Land

Paul J Hylarides

Yannick Philippaerts


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Issue 88