Arnold + Siedsma

WTR Research

The WTR 1000 focuses exclusively on trademark practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal trademark expertise.

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Operating out of 11 European offices, Arnold & Siedsma is “a true partner who knows its clients well, prioritises their business needs and maximises their branding budgets too. Its team is extremely competent and proactive – both in its execution and in terms of its strategic vision”. Co-heading the practice, Joop Elzas and Karin Becks set the tone. A stand-out for “the excellence of his work” and his “commercially minded advice”, Elzas has previously led the trademark departments at two prestigious IP firms, as well as managing his own agency, and thus runs a tight ship at Arnold & Siedsma. “Effective and solution oriented”, Becks is “highly analytical but also realistic” – traits that prove invaluable when developing robust portfolios. “Clients get incredible results with her, because she has an excellent understanding of their priorities and interests, and she genuinely cares about them too.” Completing a stellar line-up is Sandra Bauwens, who also receives glowing praise from patrons: “In my dealings with Sandra, I am always completely satisfied. She keeps her cool, counsels proactively and gives us confidence that we’re getting the best advice available. Simply, she is one of those trademark attorneys that you love to have on your team.”

Firm Profile

Arnold & Siedsma was established in 1920 and over the past 100 years has become a full-service IP firm, offering prosecution and litigation services in relation to patents, trademarks and designs. Our team consists of more than 60 technical and legal professionals. We operate from the Netherlands, Belgium, Germany and Switzerland

As part of a full-service IP firm, our trademark team explores the best suitable strategy for our clients with a broader view than just trademarks. We benefit from IP awareness that is created in the field of patents as well as litigation, and vice versa. But the broader view also reveals solutions to complex issues that are out of the box. We also dare to say “no” to our clients. We have one goal: to meet our clients’ interest in the best possibleway.

This can be achieved only by curious people who embrace new challenges and want to experience what is happening in this new world. People involved with clients’ business, seeing the broader picture and advising how IP suits best and brings most. This approach is the pride of ourfirm!

ISO 9001 certified

For the past 100 years, we have been a reliable partner to our clients with regard to all IP issues. In 2015 we became the first large Dutch IP agency with foreign offices to be ISO 9001 certified. This certification is valid for all our offices in all countries. We are proud of our ISO 9001 certification because it confirms the high quality of the processes of ouroperation.


At Arnold & Siedsma we believe in customised work and this can be seen in the way we operate: say what you do, do what you say, proveit.

The lines of communication with our specialists are short and personal. Service is our top priority. We stay in close touch with our clients so that we can provide them with a fast and responsive service. At Arnold & Siedsma we follow the four eyes principle, and we will assign a dedicated team to each of your cases. The long-term relationships we foster ensure that we know our clients’ business and strategy, which in turn means that the team will be able to give you the best advice for your business, in line with your multi-annual planning. Our attorneys will maintain regular contact with you. The protection of an innovation is of great economic value, but can also be costly. This is why, at Arnold & Siedsma, we attach great importance to clear communication throughout the entire process and we try to work as cost effectively aspossible.

Because we are a full-service IP provider, we handle all IP work. Our patent attorneys, trademark attorneys and design attorneys work closely with our litigation team. We can pull together a team from several disciplines, enabling us to handle cross-discipline IP cases quickly, seamlessly and without unnecessary costs. Arnold & Siedsma is uniquely positioned as a service provider in the Netherlands thanks to this team-basedapproach.

Arnold & Siedsma is your actively involved and knowledgeable partner. We are happy to be of service and contribute to our clients’ ideas.

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