European patent validation (EP Validation) is the system by which a European patent granted by the EPO 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.
Normally, a European patent can be brought into force in EPC member states following grant. The validation system extends this possibility 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.
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 terms for expanding patent protection beyond EPC member states:
| 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.
Validation is currently available in the following states:
| 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 validated, a European patent has the same effect as a national patent and is applied in accordance with national patent legislation. Infringement and invalidation actions are handled by national courts. Although the patent is examined centrally at the EPO, 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.
The validation system benefits both patent holders and cooperating states. A single European patent application can cover a large number of countries without separate national examinations, eliminating the need to engage multiple local patent attorneys, pay separate examination fees in each country, or manage multiple parallel application processes.
Patents are examined to EPO standards, considered among the highest in the world. The system also enables protection in rapidly growing markets outside Europe, making it a powerful tool for international patent strategy.
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.
Validation also works in conjunction with international PCT applications, provided that the EPO is designated for a European patent, the validation state is designated for a national patent in the PCT application, and the validation agreement was in force on the international filing date.
It is important to distinguish between EP Validation, the Unitary Patent, and the Unified Patent Court (UPC). EP Validation applies to states outside the EPC, is based on bilateral agreements, and leads to national patent effects. The Unitary Patent applies to UPC member states within Europe and creates uniform patent protection across multiple EU countries. The UPC is a common patent court for Europe. These systems operate in parallel but on different legal bases.
New validation agreements are continuously being negotiated. The Costa Rica agreement demonstrates that the system is expanding beyond Europe, 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.