Preliminary injunction: costs drivers
A preliminary injunction in a patent dispute costs more or less depending on how quickly you can prove urgency, how many parties and jurisdictions are involved, and whether the other side resists. There is no application fee beyond standard court costs. The real driver is the volume of evidence and expert input a court needs to be convinced within a short window, before the point where continued infringement becomes harder to reverse.
What actually drives the cost
Four factors move the bill more than anything else. The first is urgency: a weak showing of urgency invites a longer, contested hearing instead of a quick decision. The second is the technical complexity of the patent itself — a mechanical claim is cheaper to argue than a claim requiring a court-appointed expert. The third is the number of respondents and their location: one local defendant is simpler than several, spread across member states. The fourth is whether security has to be posted before enforcement, which adds a financial layer separate from legal spend.
Each of these factors compounds. A technically complex patent with an out-of-country respondent and a genuine dispute over urgency turns a single hearing into a multi-stage process, and every stage adds working hours before a decision is even reached.
Stages and documents
The table below sets out the typical shape of the procedure. Exact timing is set by the court handling the case and is not fixed by a uniform calendar, so it is described here by stage rather than by day count.
| Stage | What happens | Who is involved |
|---|---|---|
| Filing the application | Applicant sets out the right, the infringing act, and the urgency argument | Patent holder, counsel |
| Court's initial screening | Registry checks completeness; incomplete filings are returned for correction | Court registry |
| Hearing, with or without the other side present | Court weighs the strength of the claim and the risk of delay | Judge, both parties if inter partes |
| Decision and any security | Court grants, refuses, or grants conditionally on security being posted | Judge |
| Enforcement or challenge | Winning party enforces; losing party may seek to have the order lifted | Bailiff, both parties, appellate forum |
Documents needed at filing typically include: proof of the patent right, a description of the infringing act with dated evidence, and a statement explaining why waiting for a full trial would cause damage that cannot later be undone. Where the infringing use is evidenced through digital or blockchain-based records rather than paper trails, the same staged logic of confirming what was recorded and when still applies — see Metadata verification step by step explained for how that verification is structured in a different asset class.
What to do first
- Instruct counsel to confirm that the patent right is currently valid and that you hold clear standing to enforce it.
- Collect dated evidence of the infringing act before anything else — screenshots, invoices, product samples, or delivery records.
- Ask counsel to draft the urgency argument early; a late or thin urgency case is the most common reason for delay.
- Decide, with counsel, whether to notify the other side before filing or to request an order without prior notice.
- Prepare for the possibility that the court will require security before granting the order, and have a position ready on amount and form.
If ownership of the patent was transferred without a signed assignment, standing to bring the application at all becomes a live question before the merits are even reached — see When the assignment is unsigned but performed in detail.
Who decides and how fast
The application is decided by the civil court with jurisdiction over intellectual property matters at the seat of the defendant or the place of infringement, sitting as a single judge for this type of application in most cases. Because the whole point of the remedy is speed, courts generally deal with these applications ahead of ordinary case load, but the exact interval between filing and decision is set case by case and is not fixed by a published table. A stronger, better-documented urgency argument tends to move faster than a contested one.
Common scenarios
If the infringement is already public and sales are ongoing, the urgency argument is usually straightforward, and the main cost driver becomes the strength of the underlying patent claim rather than procedural delay.
If the respondent is based in a different member state, cross-border service and recognition of any order add a layer of coordination that increases both time and cost, independent of how strong the patent claim is.
If the other side raises a validity challenge to the patent itself as a defence, the injunction hearing can turn into a preliminary assessment of validity, which is more expensive than a straightforward infringement-only hearing.
What this page does not cover
This page describes the mechanics of the procedure only. It does not name specific statutory deadlines or fee schedules, because those sit in a national procedural layer this page deliberately does not cite — any number not confirmed against a verified source is left out rather than estimated. It also does not cover the separate question of what can be established about a counterparty before litigation starts; that sits in a different part of the site, see Counterparty in United Kingdom in practice for how a pre-litigation check on the other side is structured. Questions of data handling during a dispute are addressed separately — see Privacy notice overview and who decides.
Related publications
A preliminary injunction is a step inside a larger dispute, not a substitute for it. For the full sequence that follows once urgency is resolved, see Main infringement action step by step.
FAQ
How long does preliminary injunction take in practice?
There is no fixed statutory countdown. Courts generally prioritise these applications because the remedy is only useful if granted quickly, and a well-evidenced urgency argument moves faster than a disputed one. The exact interval depends on the court's own docket and on whether the other side is heard before the decision.
Which documents are needed to start?
At minimum: proof that the patent right exists and is currently valid, dated evidence of the infringing act, and a written explanation of why delay would cause harm that a later judgment could not fully repair. Cross-border cases add proof of where the respondent can be served.
What happens if the other side does not respond?
A court can still decide on the basis of the applicant's filing alone, particularly where the application was made without prior notice for urgency reasons. Non-response does not automatically mean the order is granted; the court still checks whether the applicant's own case is sufficient.
Next steps
If your situation involves a licensee who has stopped paying but continues to sell, the cost drivers differ from a straightforward third-party infringement case — see A licensee stops paying and keeps selling patent what.
If the dispute instead traces back to a licence where the parties never agreed the territory in the first place, that question needs resolving before an injunction strategy makes sense — see When the parties never agreed the territory in detail.