Stay pending validity: documents to prepare
A stay pending validity pauses an infringement action until a parallel challenge to the patent's validity is resolved. To request or oppose it, a party needs the pleadings, the validity filing, evidence of overlap between the two proceedings, and a clear timeline showing why parallel proceedings create a real risk of conflicting outcomes.
Why the stay matters
An infringement claim and a validity challenge can run at the same time, in different bodies, over the same patent. If the patent is later revoked, narrowed, or amended, an infringement judgment reached in the meantime may need to be reopened, appealed, or quietly abandoned. A stay is the mechanism that avoids that outcome: it holds the infringement case in place until the validity question is settled elsewhere.
The trade-off is delay. Holding the infringement case can add months to a timeline that was already running, and the party accused of infringement often benefits from that delay more than the patent holder does. That asymmetry is exactly what a deciding body weighs when it looks at a stay request, and it is why the request needs to be built on documents, not on an assertion that the two proceedings overlap.
The delay is also the reason opposing counsel resists a stay as a matter of routine. Expect the request to be contested even where the overlap between the two proceedings looks obvious on paper.
What to prepare
Build the file before filing the request. Missing documents are the single most common reason a stay motion is rejected outright, before the deciding body even reaches the balancing test.
- Collect the pleadings from both proceedings and confirm, claim by claim, that they concern the same patent or the same family member. A partial overlap needs to be stated as partial, not rounded up.
- Obtain a certified copy of the validity filing, including its filing date, its current procedural stage, and any deadline already fixed for the next step in that proceeding.
- Draft a short comparison memo setting out exactly where the two proceedings overlap on claims, grounds, or evidence. A vague statement of overlap invites a vague refusal.
- Prepare a timeline exhibit listing every deadline already fixed in both proceedings, so the deciding body can see the actual scheduling conflict rather than a general risk.
- Ask the client for a written position on tolerable delay. The deciding body will weigh prejudice to each side, and a position without evidence behind it carries little weight.
- Assign one contact person authorised to respond to procedural queries while the request is pending, since delays in responding to the deciding body's own questions can undermine the request itself.
Stages and typical documents
The table below sets out the stages in the order they normally occur. Not every stage produces a filing; the assessment stage is internal to the deciding body and generates no document from the parties.
| Stage | Who acts | Document to prepare | What it establishes |
|---|---|---|---|
| Filing the request | Party seeking the stay | Motion for stay with supporting brief | Grounds for suspension |
| Response | Opposing party | Response brief with evidence of prejudice | Case for continuing without delay |
| Assessment | Deciding body | No filing required from the parties | Balancing of delay against the risk of conflicting rulings |
| Order | Deciding body | Stay order or refusal | Formal suspension or continuation of the infringement case |
| Monitoring | Both parties | Periodic status report on the validity proceeding | Continued justification for the stay |
| Lifting the stay | Either party | Motion to lift, attaching the validity decision | Resumption of the infringement case |
Who decides
The stay is decided by the body handling the infringement claim itself: a national court, or the tribunal handling the case where the dispute sits within the unitary patent framework. That body looks at the validity proceeding only to judge overlap and timing. It does not assess the merits of the validity challenge, and a stay motion that argues the merits of validity is arguing the wrong point to the wrong body.
Where the two proceedings sit in different countries, the deciding body will also ask for confirmation that the validity challenge is genuinely pending, filed, and progressing, rather than merely announced or threatened. Mapping a right to a token in detail follows a similar logic in a different setting, where the underlying right sits on a registry rather than in a court file, and the comparison is useful for spotting what a deciding body actually treats as proof of status rather than a mere claim of it.
The point of no return
A request for a stay becomes far harder to win once the infringement case has moved past preliminary exchanges and into substantive hearings. Deciding bodies grow reluctant to interrupt a case once meaningful resources have already gone into it, and a late request looks like a delay tactic rather than a genuine response to a real overlap. File the request as soon as the validity challenge is confirmed pending, not after the infringement case has developed its own momentum.
On the other side of the timeline, once a stay is granted, lifting it before the validity proceeding actually concludes is rarely possible. Build the monitoring step into the file from day one, with a fixed schedule for status reports, rather than waiting for a client to ask where things stand.
Scenarios
If the validity challenge was filed only after the infringement claim, expect closer scrutiny of the timing. Prepare a short explanation for the gap rather than leaving the deciding body to assume the challenge was filed purely to gain delay.
If the opposing party has already incurred substantial litigation cost in the infringement case, the overlap argument alone will not carry the motion. Prepare a cost-and-prejudice comparison that sets out what continuing without a stay would actually cost each side.
If the case involves a counterparty whose standing, filings, or corporate status are not yet independently confirmed, resolve that question in parallel with drafting the stay request rather than after it is filed. A stay built on an unverified counterparty is a stay built on a gap that opposing counsel will find quickly.
Sources and limit
This page describes the procedural mechanics of a stay pending validity: the stages, the documents, and the timing pressure points. It does not set out the substantive test for validity itself, and it does not replace a jurisdiction-specific check of the actual proceeding involved, which varies by forum. Where the opposing party is a counterparty whose status needs independent confirmation before a stay request is drafted, Counterparty in Latvia in detail sets out what a registry check can and cannot confirm.
Handling documents from a parallel proceeding sometimes means handling data supplied by or about a third party. Where that applies, the data handling terms follow the same structure described in Data processing agreement step by step.
Verified
Reviewed against the publicly available procedural rules of the courts and tribunals typically handling patent infringement and validity proceedings within the EU, current as of 12 June 2025. This page does not cite specific statutory provisions. Procedural detail on stays varies by forum, and the actual rules of the body handling a given case should be confirmed before a motion is filed.
Frequently asked questions
How long does stay pending validity take in practice?
There is no fixed duration. The stay lasts as long as the validity proceeding takes to conclude, and that proceeding runs on its own timeline, separate from the infringement case it has paused.
Which documents are needed to start?
At minimum: the pleadings from the infringement case, a certified copy of the validity filing, a comparison memo showing where the two proceedings overlap, and a timeline exhibit of the deadlines already fixed in both cases.
What happens if the other side does not respond?
A deciding body can rule on the request without a response, based on the motion alone, though most bodies allow a short additional period before doing so to avoid a decision taken on one side only.
Related reading
Settlement and licence on judgment step by step covers the stage that follows once the infringement case reaches a judgment rather than a stay.
Next steps
If a stay looks likely to apply to a case, the next question is usually what the underlying claim actually covers. What to do first in this situation sets out how to check that before filing anything.
If the parallel proceeding started because a deliverable was accepted without a formal transfer of rights, When the deliverable was accepted but never transferred and addresses that starting point directly.
If the dispute began with a warning letter rather than a filed claim, What it costs to be wrong in this situation sets out what a wrong response actually costs.