European patent validation (EP Validation) is the system by which a European patent granted by the EPO (European Patent Office) can be made effective not only in EPC member states, but also in countries that are not full members of the European Patent Convention (EPC). It is a significant part of international patent strategy, particularly for companies seeking protection in markets outside Europe through a single, centrally processed patent application.
EP Validation is based on bilateral agreements between the European Patent Organisation and individual states. Once validated, the patent has essentially the same legal effect in that state as a nationally granted patent — without requiring a separate national patent application.
EP Validation extends the reach of a granted European patent to countries outside the EPC. When an applicant pays the validation fee within the required deadline, the European patent application can be validated in that state, and the subsequently granted patent acquires the effect of a national patent there — without requiring a separate national examination process.
Rights, infringements, invalidations, and proceedings are then governed by that country’s national law. The applicant does not need to go through the patent examination process again at the national patent office.
The EPO highlights that the validation system offers high legal certainty, cost-effective protection in new markets, consistent examination quality, and a simpler procedure compared to separate national applications.
The EPO uses two similar but distinct systems for expanding European patent protection beyond EPC member states: the extension system and the validation system. Both allow a European patent to take effect in non-EPC countries, but they differ in scope and origin.
| System | Purpose |
|---|---|
| Extension | Older system for non-EPC but European states |
| Validation | Newer system, not limited to Europe |
The extension system was used particularly before many Eastern European countries joined the EPC. Today, the only active extension state is Bosnia and Herzegovina. The validation system was introduced from 2010 onwards and enables cooperation with countries outside Europe as well.
EP Validation is currently available in six states. The table below lists each country, its country code, and the date the validation agreement entered into force.
| Country | Code | Entry into force |
|---|---|---|
| Morocco | MA | 1.3.2015 |
| Republic of Moldova | MD | 1.11.2015 |
| Tunisia | TN | 1.12.2017 |
| Cambodia | KH | 1.3.2018 |
| Georgia | GE | 15.1.2024 |
| Lao People’s Democratic Republic | LA | 1.4.2025 |
Additionally, Costa Rica signed a validation agreement in December 2024, but the system has not yet entered into force there.
Every European patent application is automatically deemed a validation request for all states with which a validation agreement is in force on the filing date. Applicants do not need to submit a separate formal request for each country.
The essential step is paying the validation fee within the prescribed deadline — generally 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.
If the fee is not paid on time, 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.
Once a European patent is validated in a non-EPC state, it has the same legal effect as a nationally granted patent in that country and is applied in accordance with national patent legislation. Although the patent is examined centrally at the EPO, infringement and invalidation actions are handled by national courts — enforcement remains a national matter.
Validation states may have their own translation requirements, publication rules, and national renewal fees. Validation often requires translation of the patent claims — and sometimes the entire patent specification — into the local language.
EP Validation allows a single European patent application to cover multiple countries outside the EPC without separate national examinations. This eliminates the need to manage multiple parallel application processes or engage separate local patent offices in each target country.
Patents validated through the EPO are examined to EPO standards, considered among the highest in the world. The system also enables protection in rapidly growing markets outside Europe — including in Africa and Southeast Asia — making it a powerful tool for international patent strategy. At Leitzinger, we help clients identify which validation states are relevant to their specific market priorities and ensure that deadlines and translation requirements are met.
The EPO also emphasises the system’s development policy impact. Validation states benefit from technical cooperation, patent office training, IT system development, and strengthening of local innovation ecosystems. In many countries, the system reduces the volume of foreign national applications and frees up local office resources for domestic innovation.
EP Validation also works in conjunction with international PCT applications. For validation to apply in a PCT route, three conditions must be met: the EPO must be designated for a European patent in the PCT application, the validation state must be designated for a national patent in the PCT application, and the validation agreement must have been in force on the international filing date.
Three distinct patent systems operate in parallel in Europe, and it is important to understand how they differ:
These systems operate on different legal bases and serve different geographic scopes. A comprehensive international patent strategy may involve a combination of all three.
New validation agreements are continuously being negotiated. The Costa Rica agreement, signed in December 2024, demonstrates that the system is expanding beyond Europe and Africa into Latin America, reflecting the EPO’s ambition to strengthen its position as a global patent system rather than solely a European patent office.
For companies navigating the complexities of European patent validation, professional guidance can significantly affect both protection effectiveness and cost efficiency. To explore how strategic patent validation can strengthen your intellectual property position, contact our experienced team for personalised guidance tailored to your specific needs and market priorities.