When a court in another country decides first: what it costs to be wrong
When a court in one contracting state rules first on the same patent, its finding on infringement or validity travels with the case. Under the Agreement on a Unified Patent Court, a single court has competence across the states where the patent has unitary effect. Being wrong at that first hearing is not a local loss.
Basis
The Unitary Patent framework rests on three linked instruments, and all three matter once two courts might hear the same claim. Regulation (EU) No 1257/2012 creates unitary patent protection across the participating states, so one grant covers the group rather than a bundle of separate national rights. Council Regulation (EU) No 1260/2012 sets the translation arrangements attached to that protection, which affects the language a proceeding runs in and, with it, how quickly counsel can act. The Agreement on a Unified Patent Court establishes the single court with jurisdiction over disputes concerning that protection. Together, these instruments mean a first ruling from one division is not a local event that a second division simply sets aside.
Practical consequence
A claimant, or a defendant filing a pre-emptive action, can choose where inside the system to bring the case first. That choice sets the forum, the working language under Council Regulation (EU) No 1260/2012, and the panel that will hear infringement and, if raised, validity together. Once a decision is reached there, it becomes the reference point for every later step in the dispute: the settlement value both sides will use, the ground an appeal is built on, and the record any second proceeding has to work around. Reacting after that hearing costs more than reacting before it, because the questions that mattered are already answered on someone else's terms.
What to do
- Instructing counsel confirms, within days of the first notice, whether the patent is a classic European patent that has been opted out of the unitary system, or falls fully inside it.
- Instructing counsel checks which division has been seized and whether a related action is already pending in a second contracting state.
- The client preserves correspondence, technical files and prior art evidence before any hearing date is fixed.
- Instructing counsel files a request to stay the second action, or files a counterclaim, before the deadline set by the division seized.
- The client's internal team confirms in advance who holds settlement authority, so a decision does not wait on internal sign-off once the clock is running.
Who decides
The local or regional division seized first decides on infringement, and on validity where it is raised as a counterclaim in the same proceeding. An appeal sits with the Court of Appeal of the Unified Patent Court, under the Agreement on a Unified Patent Court. Neither body reopens a finding because a party disputes the outcome after the fact; the evidence and arguments have to be complete when filed.
| Stage | Forum | What is decided |
|---|---|---|
| First filing | Division seized first | Which court proceeds; whether a stay applies to a later filing |
| Merits hearing | Same division | Infringement, and validity if raised as a counterclaim |
| Appeal | Court of Appeal of the Unified Patent Court | Review of the first-instance finding |
Forks
If the patent has never been opted out of the unitary system, the division seized first normally keeps the case, and a later filing elsewhere does not create a second, independent outcome. If a development partner is also asserting rights over the same invention, ownership is argued on its own timeline, separately from infringement — see When a development partner claims joint ownership and its for how that question is resolved. If the disputed right is represented through a tokenised record rather than registered with a national office, the question of who may bring a claim at all comes first — see When the token refers to an unregistered right step.
Related situations
A related but distinct problem arises when the scope of the claim itself is disputed, rather than which forum decides it — see When the claim covers only part of the range. The forum question and the scope question are often argued together, but they call for different evidence and different timing.
Sources and limit
This page does not set out how long any transitional period under the unitary system runs, and it does not estimate cost or duration for a specific dispute — both depend on which division is seized and how contested validity turns out to be. It does not cover forums outside the states party to the Agreement on a Unified Patent Court, including disputes that sit entirely within a single national system. Where a counterparty abroad is involved before any filing is made, an earlier check on that counterparty may prevent the dispute from arising at all — see Counterparty report before onboarding a distributor and the deadline. Where local delivery partners take part in evidence-gathering or enforcement abroad, their role is set out separately — see Subprocessors, including local delivery partners.
Checked: 5 February 2025. Sources: Regulation (EU) No 1257/2012; Council Regulation (EU) No 1260/2012; Agreement on a Unified Patent Court.
FAQ
What is the first step when a court in another country decides first?
Confirm which division was seized first and whether the patent sits inside the unitary system or has been opted out. That answer decides whether a second filing elsewhere can proceed on its own or must be stayed.
Which deadline is already running?
The deadline to respond to the first division's proceedings, or to file a request for a stay, starts from the notice of that action — not from when a second filing is drafted.
Who decides, and on what evidence?
The division seized decides on the evidence filed by both sides, including prior art and any counterclaim on validity. The Court of Appeal of the Unified Patent Court reviews that finding; it does not accept new strategy after the fact.