EP Validation is a system that allows a European Patent granted by the European Patent Office (EPO) to be made enforceable in countries that are not full member states of the European Patent Convention (EPC). It forms a key part of international patent strategy for companies seeking protection in markets beyond Europe through a single, centrally processed patent application.
EP Validation is based on bilateral agreements between the European Patent Organisation and individual states. The system allows the effects of a European Patent to be extended into a validation state without requiring a separate national patent application. Once validated, the patent has essentially the same legal effect in that state as a nationally granted patent.
Every European patent application is automatically considered a validation request for all states with which a validation agreement is in force on the filing date. No separate formal request is needed for each country. The essential step is paying the validation fee within the prescribed time limit.
Once validated, the patent operates under the national patent legislation of the relevant state. Infringement actions, invalidity proceedings, and enforcement are all handled by national courts.
The validation fee must generally be paid within six months of publication of the European search report, or in Euro-PCT applications, by the deadline for entry into the European phase — whichever expires later. Missing this deadline means the validation request is deemed withdrawn and the right to validation in that state is lost. In some cases, a two-month grace period is available with a 50% surcharge.
The EPO highlights several core advantages of the validation system. A single European patent application can cover multiple countries without separate national examination procedures, eliminating the need to engage local patent attorneys in each country, pay separate examination fees, or manage parallel application processes.
The patent is examined to EPO standards, regarded as among the highest in the world, providing strong legal certainty and consistent examination quality. The system also offers a cost-effective route to protection in new and emerging markets outside Europe.
Validation is currently possible in the following states:
| Country | Code | Entry into force |
|---|---|---|
| Morocco | MA | 1 March 2015 |
| Republic of Moldova | MD | 1 November 2015 |
| Tunisia | TN | 1 December 2017 |
| Cambodia | KH | 1 March 2018 |
| Georgia | GE | 15 January 2024 |
| Lao People’s Democratic Republic | LA | 1 April 2025 |
Costa Rica signed a validation agreement in December 2024, but it has not yet entered into force. The EPO continues to negotiate new agreements, reflecting its ambition to strengthen its role as a global patent system.
The EPO uses two related but distinct terms for extending European patent protection beyond EPC member states:
| System | Purpose |
|---|---|
| Extension | Older system for non-EPC European states |
| Validation | Newer system, not limited to Europe |
The Extension system was used particularly before many Central and Eastern European countries joined the EPC. Today, Bosnia and Herzegovina is the only active extension state. The Validation system has been in place since 2010 and enables cooperation with countries outside Europe as well.
Three separate systems operate in parallel but on different legal bases:
EP Validation applies to states outside the EPC, is based on bilateral agreements, and results in national patent effects in each validated state.
The Unitary Patent applies to participating EU member states within the UPC framework and creates uniform patent protection across those states with a single registration.
The Unified Patent Court (UPC) is a common patent court for Europe handling litigation relating to European Patents and Unitary Patents in its member states.
These systems complement each other and can be combined as part of a broader international patent strategy, but they serve different geographical and legal purposes.
Validation states may have their own translation requirements, publication rules, and national renewal fee obligations determined by national legislation. Validation often requires translating the patent claims, and in some cases the entire patent specification, into the local language.
Once validated, the patent is governed by national law. Although examined centrally by the EPO, its enforcement remains national in each validated state.
Managing EP Validation requires expertise in international patent law, national requirements, and strategic business planning. For guidance on EP Validation strategies tailored to your specific needs, contact our experienced team to discuss how we can help secure your patent protection.