European Patent, PCT or National Patent Application: Which Route Should You Choose?

1. Understanding the Three Filing Routes

The key question is not simply which route is preferable, but which route best supports your intended geographical coverage, commercial objectives and decision-making timeline.

A PCT application does not, by itself, result in a worldwide granted patent. Likewise, a European patent application does not eliminate the need to consider territorial coverage and post-grant requirements.

References: WIPO guidance on the PCT; EPO guidance on national validation.

2. When Should a National Patent Application Be Considered?

Direct national filing allows an applicant to pursue patent protection before the patent offices of selected countries.

Where the target countries are already known, the costs of filing, translation and local prosecution can be evaluated in advance.

Filing an initial application in Türkiye and subsequently seeking protection abroad is one possible strategy. However, it is not the only appropriate sequence for every invention or applicant. Applicable national security provisions and other rules concerning the place of first filing should also be considered.

For the Turkish part of a patent portfolio, our patent drafting and prosecution services address the available procedural options. Where additional jurisdictions are involved, coordination with qualified local patent representatives should form part of the overall strategy.

3. What Does a European Patent Application Offer?

The European patent route provides a centralised filing and examination procedure before the European Patent Office (EPO).

Türkiye is a contracting state to the European Patent Convention (EPC). Importantly, the geographical scope of the EPC is not identical to membership of the European Union. See the EPO’s legal foundations and member states.

Where several European markets are commercially relevant, the advantages of centralised examination should be considered alongside country-specific post-grant requirements and costs.

Our European patent practice covers the preparation, filing and prosecution of European patent applications.

Is a European Patent the Same as a Unitary Patent?

No.

Following the grant of a European patent by the EPO, unitary effect may be requested if the applicable conditions are satisfied.

The territorial coverage of a Unitary Patent is limited to participating EU Member States covered by the system. It does not extend to Türkiye.

Patent protection in Türkiye must therefore be addressed separately through the applicable procedures. Source: EPO — Unitary Patent.

For European patents requiring protection in Türkiye, see our European Patent Validation in Türkiye service.

4. What Does a PCT Application Provide?

The Patent Cooperation Treaty (PCT) establishes an international filing procedure through which applicants may subsequently pursue patent protection in selected national or regional jurisdictions.

The international phase does not itself result in the grant of a patent. Grant decisions remain within the competence of the relevant national or regional patent offices. Source: WIPO — national phase entry.

Where target markets, investment discussions or licensing arrangements have not yet been finalised, the PCT route may provide valuable flexibility in the timing of subsequent country decisions.

However, the PCT procedure involves its own international-phase costs. Deferring national or regional phase decisions does not necessarily reduce the total cost of obtaining patent protection.

Can a PCT Application Lead to a European Patent?

Yes.

A PCT application may subsequently enter the European regional phase before the EPO.

Consequently, the question “European patent or PCT?” may be unnecessarily restrictive. A strategy may involve an initial PCT application followed by entry into the European phase. Source: EPO — entry into the European phase.

Applicants wishing to enter the Turkish national phase of a PCT application may consult our PCT National Phase Entry in Türkiye service.

5. Timing: First Filing, Priority and Subsequent Phases

Under the Paris Convention priority system, a subsequent patent application claiming priority from an earlier application must generally be filed within 12 months of the first filing.

The requirements for a valid priority claim, including whether the claimed technical subject matter is supported by the earlier application, must be assessed separately. See WIPO’s priority explanation.

The priority period, the deadline for PCT national phase entry and the time limits for post-grant validation of a European patent are distinct procedural periods triggered by different events.

A deadline applicable to one procedure should not be assumed to apply to another.

For each intended national or regional phase, the applicable rules and deadlines of the competent office should be verified.

Before discussing a filing strategy, applicants should ideally provide:

• The first application number and filing date.
• Details of any claimed priority.
• Information about previous public disclosures.
• The countries in which protection may be required.

These records allow the remaining procedural time limits and available options to be assessed.

6. How Should Patent Filing Costs Be Compared?

Comparing only the initial filing invoice can be misleading.

A meaningful comparison requires a phased budget based on the same intended territorial coverage and scope of professional services.

The budget should distinguish between the following stages:

• Initial preparation and filing — Technical assessment, preparation of the patent specification and claims, and filing of the first application.
• International or regional phase — Official fees and professional costs associated with the selected international or regional procedure.
• National phases — Local representation, translations and applicable national phase entry requirements.
• Examination and grant — Responses to office communications, amendments, prosecution and post-grant formalities.
• Ongoing portfolio management — Renewal fees and any additional professional services requested during the lifetime of the portfolio.

An initial budget for protection in three identified countries cannot necessarily be compared directly with a strategy designed to preserve options in ten countries.

A useful budget should therefore indicate not only the anticipated costs but also when particular decisions must be taken and which expenses are excluded from the quoted scope.

7. Three Illustrative Business Scenarios

Scenario A: A Manufacturer Primarily Targeting Türkiye

A manufacturer whose current commercial activities are concentrated in Türkiye may initially focus on preparing a technically sound patent application and securing appropriate protection in the Turkish market.

If future exports or licensing opportunities are possible, the company should also identify when its international filing strategy needs to be reconsidered.

Scenario B: A Technology Company Targeting European Markets

Where a company has identified several commercially important European countries, direct European filing and other possible filing routes can be compared in light of its existing application status.

The analysis should include post-grant national requirements and the longer-term costs of maintaining the resulting patent portfolio.

Scenario C: A Start-up Considering Europe and the United States

A start-up whose investment and market-entry plans remain uncertain may compare the timing and costs of a PCT application with those of direct national or regional filings.

Expected investment, the quality and completeness of the technical disclosure, and applicable filing deadlines should all be considered.

These scenarios are illustrative planning examples. They do not imply that any particular filing route is universally preferable.

8. Decision Checklist Before Consulting a Patent Attorney

Before selecting an international patent filing route, consider the following questions:

• Which countries are commercially important for manufacturing, sales or licensing?
• Has an initial patent application already been filed, and what technical subject matter did it disclose?
• Has the invention been publicly disclosed through a product, publication, sale or presentation?
• Which market-entry decisions have already been made, and which remain open?
• What budget is available for the initial filing and subsequent national or regional phases?
• When are investment rounds, product launches or licensing negotiations expected?

These details provide the starting point for a structured discussion of the available filing routes.

You may contact Stan Advoka to discuss an appropriate patent filing strategy. A suitable confidential communication channel can be arranged for the exchange of sensitive technical documents.