Does a US Patent Cover Europe? No — Deadlines & EPO Route

No. A US patent is enforceable only in the United States. It does not stop a competitor from making, using, importing or selling the same invention in Germany, France, the UK or anywhere else in Europe. Patent rights are territorial: protection exists only in the countries where a patent has actually been granted and kept in force.

That answer raises the three follow-up questions US companies actually need answered: how long do we still have to file in Europe, how different is European examination from the USPTO, and what will it cost. Each is covered below.

How long do you have to file in Europe? The key deadline is twelve months from your earliest US priority date (the Paris Convention year). Within that year you can file a direct European patent application at the EPO, or file an international (PCT) application. A PCT filing buys more time: the European regional phase must be entered by 31 months from the priority date. Miss the twelve-month window without a PCT filing and your own published US application usually becomes prior art against you — the invention is then unprotectable in Europe, whatever the US patent says.

Is there a grace period? Effectively no. The US allows a one-year grace period for the inventor's own disclosures; the EPO does not. Any public disclosure — a conference talk, a datasheet, a trade-show demo, a published US application — before your priority date destroys novelty in Europe. This is the single most common way US companies lose European rights that their US patent led them to believe they had.

What does the European route look like? Most US applicants enter through the European Patent Office: either a direct European filing or a PCT regional-phase entry. The EPO runs one central search and examination. Once granted, the patent either takes unitary effect as a Unitary Patent covering most EU member states, or is validated as a bundle of national patents in the countries you choose. The UK, Switzerland, Norway and Turkey sit outside the Unitary Patent and always require separate validation.

How does EPO examination differ from the USPTO? More than most US teams expect. The table above summarises the practical differences. The one that costs the most money is added matter: the EPO requires literal support in the application as filed for every amendment, so a US-drafted specification with thin fallback positions leaves you unable to amend your way out of an objection. Reviewing the specification for European fallback positions *before* filing is far cheaper than discovering the gap at examination.

What does it cost? Budget €12,000–€30,000 in combined official and attorney fees from filing to grant, plus renewal fees that start in year three and escalate to roughly €6,000 in year twenty. A worked example: a mid-complexity software case entering the regional phase from a PCT costs roughly €3,500 to enter and put in order, €2,010 for examination, €3,000–€6,000 across two examination rounds, and about €1,600 in designation and grant fees — then either one Unitary Patent renewal stream or national validation in your three or four commercial markets. The full breakdown is in the European patent cost guide, and the attorney-fee side is quoted per stage on the European Patent Attorney services page.

Does the UK count? No. The UK left the EU but remains a member of the European Patent Convention, so a European patent can still be validated there — it simply is not covered by the Unitary Patent. Treat the UK as a separate validation decision driven by whether you sell or manufacture there.

What if a competitor is already selling in Europe? Your US patent gives you nothing against them there. Options are limited to whatever European rights you or your PCT filing still support, so the priority is a fast audit: pending PCT applications, unexpired priority years, and any unpublished inventions that can still be filed in Europe before disclosure. A European Patent Attorney working directly with US companies can run that audit against your priority dates in a few days.

Does a US provisional application help? Yes, if you act inside the year. A US provisional establishes a priority date you can claim in a European or PCT filing for twelve months, provided the provisional actually discloses what you later claim. Because the EPO applies a strict added-matter test, a thin provisional often supports a much narrower European claim than the US continuation you eventually get.

Can I still file in Europe after my US patent has granted? Almost never. Grant means publication, and publication before your European priority date is novelty-destroying with no grace period. The only routes left are a pending PCT application whose 31-month deadline has not passed, or a genuinely new invention — an improvement that has not yet been disclosed.

Does a US patent stop European goods entering the United States? That, it does. A US patent supports exclusion of infringing imports at the border and ITC proceedings. What it cannot do is stop the same product being made and sold inside Europe, or stop a European competitor supplying every market except the US.

What happens to the patent once it is granted in Europe? Within three months of grant you either validate country by country or request unitary effect, and the cost profile of each choice differs sharply — see European patent validation costs by country and the EPO renewal fees hub.

The key takeaway is to treat the US and European portfolios as separate projects on separate clocks. Early claim strategy, disclosure discipline and a European review before the twelve- or thirty-one-month deadline are what turn a US-only patent into enforceable European protection. See the European patents overview for how the process runs end to end.

Why hire a European patent attorney when bridging from the US? The twelve-month and thirty-one-month deadlines are hard, the EPO does not share USPTO assumptions on added matter or grace periods, and the cost of a late-stage mistake is far higher than the cost of an early review. A European Patent Attorney can confirm what remains filable, map the right route (direct EP, PCT regional phase or Unitary Patent), and prosecute the file with the US applicant in mind. Read more about European patent prosecution services for US applicants.