When a court in another country decides first: what to do first
When a court in another country has already ruled or is already seized of the same patent dispute, do not start a duplicate claim on the same facts. Check which forum was seized first, hold any parallel filing, and route the file through counsel before the next procedural deadline passes.
The basis: which forum has priority
European patent litigation now runs on two parallel tracks. The Agreement on a Unified Patent Court created a single court for European patents with unitary effect, alongside the older system of separate national patents. Regulation (EU) No 1257/2012 and Council Regulation (EU) No 1260/2012 set the framework for unitary protection and its translation arrangements.
During the transitional period, a European patent without unitary effect may still be litigated before a national court instead of the Unified Patent Court. That is the situation behind this page: a court in another country was seized first, and its priority now decides where your dispute is heard.
What changes for you
A court seized first holds priority over the same dispute. A second claim on the same patent, the same parties, and the same infringement or validity question is normally stayed or dismissed once the first proceeding is on record. The date that matters is not when you filed — it is when the other court was seized. Missing this turns a case on the merits into a case about jurisdiction, and jurisdiction disputes run on their own timetable.
What to do, in order
- Instruct counsel to obtain the foreign court's own record of the seizure date — the claim form date is not always the same day.
- Ask counsel to confirm whether the foreign proceeding covers the same patent family, the same parties, and the same cause of action; a partial overlap changes the analysis.
- Hold any parallel filing you are preparing until the jurisdiction question is settled — a claim filed into a forum that is later stayed wastes the deadline it was meant to protect.
- If goods embodying the disputed patent are moving across a border, file an application for customs action under Regulation (EU) No 608/2013 while the jurisdictional question is resolved.
- Have local counsel confirm the current procedural stage of the first-seized proceeding — a first-instance ruling and a case still at the filing stage call for different responses.
- Route the file to counsel admitted before the forum that holds priority, before responding to any deadline that forum has already set.
Who decides, and where
The forum is decided by priority of seizure, not by preference of either party. Within its own jurisdiction, the Unified Patent Court examines its own competence, including any competing national filing, before it reaches the merits.
| Situation | Who decides | What is examined |
|---|---|---|
| Same patent, same parties, a national court seized first | The court seized first | Whether the later claim duplicates the same cause of action |
| European patent with unitary effect, the Unified Patent Court seized | The Unified Patent Court, under the Agreement on a Unified Patent Court | Its own jurisdiction and any competing national filing |
| Goods embodying the patent crossing a border during the dispute | The customs authority | Whether the goods match the description filed under Regulation (EU) No 608/2013 |
If your situation differs
If the underlying dispute is really about who owns the patent — for example, after a founder left with a working prototype — resolve the ownership question first; jurisdiction only matters once ownership is settled. See When a founder leaves with the prototype and its full account of that decision cost.
If the disputed patent covers a technology embedded in a tokenised or digital-asset product, a parallel dispute can also arise on a marketplace's own rules, separate from any court's jurisdiction. That situation is addressed on its own page: When a marketplace delists the collection explained.
If the first-seized court has already issued an interim injunction, treat that order as binding until a higher court changes it — arguing jurisdiction after an injunction is in force rarely stops its effect.
What this page does not cover
This page does not decide who owns the patent, does not calculate damages, and does not verify the party on the other side of the dispute. Some clients first want to know what can be confirmed about that counterparty before deciding how hard to contest the foreign ruling. That question is answered on its own page: Counterparty in Norway explained.
Verified
This page was checked against its sources in June 2024. The instruments cited are the Agreement on a Unified Patent Court, Regulation (EU) No 1257/2012, Council Regulation (EU) No 1260/2012, and Regulation (EU) No 608/2013 on customs enforcement of intellectual property rights. Every first response to a query like this one is logged and reported without editing: Delivery statistics, published automatically.
Related reading
The same first-response logic applies when the scope of the claim itself is only partial rather than complete. See What to do first in this situation and the narrower check it requires before any filing goes ahead.
Frequently asked questions
What is the first step when a court in another country decides first?
Do not file a duplicate claim. Ask counsel to obtain the exact seizure date of the foreign proceeding and compare it against any filing you are preparing. Priority runs from that date, not from the date you file.
Which deadline is already running?
The deadline that matters is the one set by the forum that was seized first, not a deadline of your own choosing. If that forum has already set a response date, treat it as binding while jurisdiction is confirmed.
Who decides, and on what evidence?
The forum decides on the evidence of seizure order: which court or which Unified Patent Court division was approached first, and whether the dispute covers the same patent, the same parties, and the same cause of action. Where goods are also crossing a border, the customs authority decides separately, on the description filed under Regulation (EU) No 608/2013.