Does a US patent protect you in Europe?
No — patent rights are territorial. A US patent gives no enforceable right in Europe. Here is how US companies typically protect inventions through the EPO.
A US patent is enforceable only in the United States. It does not stop a competitor from making, using or selling the same invention in Europe, the UK or elsewhere.
For Europe, most US companies enter through the European Patent Office (EPO). You can file a European patent application directly, or enter the regional phase of an international (PCT) application.
The EPO examines the application centrally. Once granted, the patent can be validated in individual European countries, or — since 2023 — take unitary effect as a Unitary Patent covering most EU member states.
European practice differs from the US in important ways: added-matter rules are stricter, claim drafting often needs restructuring, and technical character matters more for software-related inventions.
The key takeaway is to treat the US and European patent portfolios as separate projects. Early claim strategy, prior-art analysis and timing can make the difference between broad protection and a narrow, hard-to-enforce patent.
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