Litigation
Conducting complex IP proceedings, including evidence gathering, invalidity actions, infringement proceedings, entitlement claims, the termination of collaborations and other disputes within IP law.
ENIntellectual property · Patent law
Solutions without detours.
Christoffel Advocatuur is a law firm specialised in intellectual property law, with a strong focus on patent law.
Established by Tjerk Sigterman, the firm specialises exclusively in intellectual property law. Sigterman brings over a decade of experience in IP advisory work and litigation, with particular expertise in patents, and is registered as a UPC Representative.
Clients range from large pharmaceutical corporations to smaller, innovative family-run enterprises, supported through complex disputes and with strategic guidance aimed at preventing litigation. The firm also provides project-based specialist support to other law firms during high-demand periods or on intricate IP matters.
His approach is clear, pragmatic, and results-driven.
At a glance
- Specialised in intellectual property & patent law
- 10+ years of IP advisory and litigation
- Registered UPC Representative
- Based in Amsterdam, working internationally
Practice areas
How the firm adds value.
Advisory
Strategic assessment of the chances of success, advice on the enforcement of IP rights and the de-escalation of conflicts.
Contracts
Drafting and reviewing agreements for the development and exploitation of IP rights, including licence agreements, R&D and collaboration agreements and non-disclosure agreements.
Second opinions / review
Providing second opinions in ongoing matters and expert review of procedural documents.
Get in touch
Curious what we can do for your case?
Feel free to call or email Tjerk Sigterman.