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International Intellectual Property 24. March 2026 · 5 min read

There Is No Such Thing as an International Patent – The Biggest Mistakes Made by Inventors and Startups

In fact, there is no such thing as a “world patent”—neither the PCT nor the EP automatically leads to a patent that is valid worldwide or “internationally,” but only to a bundle of national or regional rights.

Many inventors and startups believe they can “file an international patent” that will then automatically take effect in all major countries. In practice, however, patent protection is always territorial, meaning that a patent is only valid in the countries where it is actually granted and maintained.

Common misconceptions:

“With a PCT application, I already have worldwide patent protection.”
“An EP patent is a unitary EU patent that automatically applies throughout Europe.”
“I can later ‘convert’ a German application into a patent in any country I choose.”

Basic principle: Patents are territorial rights

Patents are territorial rights: They apply only in the countries for which a patent has been claimed and granted.

Key consequences:

A German patent provides protection only in Germany.
A European patent must be validated in the desired EPC member states after grant and functions there like a national patent.
For non-European countries (e.g., the U.S., China, Japan), separate national procedures or the PCT route are required.
Strategic planning therefore involves securing the relevant markets with as few applications as possible—but a single “international patent” does not exist.

What is a PCT application (not an international patent)?

A PCT application is an “international patent application” under the Patent Cooperation Treaty (PCT). It simplifies and bundles the process for many countries, but does not replace national or regional procedures.

Key points:

A PCT application functions as a bundle of national applications in up to approximately 150–158 contracting states.
The procedure has two phases: the international phase (search, and preliminary examination if applicable) and the national/regional phases.
No later than approximately 30–31 months from the priority date, you must enter the national phase in the desired countries and pay the respective fees there.

Common misconception:

A PCT application never directly leads to a patent, but only provides the opportunity to transition relatively easily into the national/regional procedures in many countries.

What is an EP patent (European patent)?

The European patent is based on the European Patent Convention (EPC) and can cover up to 39 countries. It is filed, searched, examined, and, if applicable, granted centrally by the European Patent Office (EPO).

Afterward:

The EP patent must be validated in the selected countries.
Legally independent national intellectual property rights are created in each validation country.
For certain EU countries, a unitary patent may additionally be selected, which offers uniform protection in currently 18 participating EU countries—but only on the basis of an already granted EP patent.

Common misconceptions:

“EP = EU patent”—in fact, the EPC also covers non-EU countries.
“EP is automatically valid throughout Europe” – without designation/validation, there is no protection in the respective country.

National Application: Foundation and Building Block of the Strategy

The national patent application (e.g., with the DPMA) remains the classic starting point, especially for SMEs and startups.

Advantages:

Relatively lower costs if only a few countries are of interest initially.
Faster and more manageable procedure in the home market.
It establishes a priority date from which international extensions (PCT, EP, further national applications) can be filed within 12 months.

Typical strategy:

Start with a national application (e.g., DE) to secure the filing date.
Decision within 12 months:
additional EP application,
PCT application,
or targeted additional national applications in key countries.

Common misconceptions among inventors and startups – and what really applies

Common misconceptions and the reality:

Misconception: “With a PCT application, I am already protected worldwide.”
Reality: The PCT is merely a procedural framework; protection arises only through national/regional patents after entering the national phase.
Misconception: “EP = international protection.”
Reality: The EP is a regional system for EPC states; outside Europe, separate (PCT or national) applications are required.
Misconception: “I can still expand abroad at any time, even years later.”
Reality: Without timely subsequent filings (typically within 12 months of priority, or within 30/31 months of national entry under the PCT), many options are irretrievably lost.
Misconception: “A single official language is sufficient in the long term.”
Reality: The PCT and EP allow, for example, German or English, but translations are required in many national phases—with corresponding costs.

Initial guidance: Which route for whom?

Rough guidelines can be derived from practical experience (this is not legal advice for individual cases):

Germany only or a few countries: National application(s) are often sufficient, possibly supplemented by an EP application for selected European countries.
Focus on Europe, many EPC member states: Direct EP application or a combination of national priority and EP within 12 months.
Global expansion, markets in the EU, US, and Asia: national priority application, followed by a PCT application to extend the deadline and subsequently select the truly relevant countries; supplemented by a European Patent for Europe.

One key point remains: Develop an individual filing strategy early on, realistically balancing the budget, target markets, and commercialization timeline.