Christoffel Advocatuur was founded by Mr. Tjerk Sigterman ([LinkedIn]) and focuses exclusively on intellectual property (IP) law. Tjerk has more than a decade of experience advising and litigating in this dynamic field, with a particular emphasis on patent law.

Over the years, he has represented a broad spectrum of clients — from multinational pharmaceutical companies to innovative, family-owned businesses. This breadth of experience enables him to resolve complex disputes effectively and to deliver strategic, practical advice aimed at preventing litigation wherever possible.
His approach is clear, pragmatic, and results-driven.

In addition to serving its own clients, Christoffel Advocatuur also works on a project basis with other law firms, providing flexible, specialist support during periods of peak workload or in highly complex IP matters.

 

Areas of expertise include:

 

• Litigation
  Evidence collection, invalidity actions, infringement proceedings, entitlement disputes, termination of collaborations, and other IP-related conflicts.

 

• Advisory services
  Evaluating the likelihood of success in anticipated or ongoing proceedings, offering strategic guidance on the enforcement of IP rights (whether by you or against you), and advising on disputes involving IP rights. The firm also provides second opinions and can be retained as an independent reviewer.

 

• Contracts
  Drafting and reviewing all types of agreements relating to the development and exploitation of IP rights, including licence agreements, R&D and collaboration agreements, and non-disclosure agreements.

 

• Second opinions & argumentation review
  Providing second opinions in cases handled by other law firms and offering thorough, independent review of legal or litigation documents — whether in support or opposition.

 

Call Tjerk (+31 6 50 82 34 30) or send an e-mail (tjerk@christoffeladvocatuur.nl) to see what Christoffel Advocatuur can do for you.