Patent Litigation in Belgium: 7 Rules to Win

A patentee who has just won an injunction in Munich often assumes the same order will stop a competitor in Brussels. It will not, unless the patent runs through the right forum. Patent litigation in Belgium is unusual in Europe: since 2015 a single court hears every patent case in the country, and Belgium sits inside both the European Patent Convention and the Unified Patent Court. Choose the venue, the evidence route and the timing well and Belgium is an efficient, well-reasoned place to enforce a patent. Choose badly and you lose a year. This guide walks through how it actually works, from the exclusive Brussels court to the damages you can collect.

How Patent Litigation in Belgium Actually Works

Patent litigation in Belgium is a civil matter decided by specialist judges. The substantive rules live in Book XI of the Belgian Code of Economic Law, which governs national patents, and are supplemented by the European Patent Convention for validated European patents. Belgium is administered on the patent side by the Belgian Office for Intellectual Property (OPRI/DIE), part of the FPS Economy, though the office grants rights rather than resolving disputes.

Two features surprise foreign rights holders. First, jurisdiction is fully centralised, so there is no forum-shopping between cities. Second, Belgian proceedings reward preparation over procedure: the case is largely built on written submissions and expert reports exchanged before a focused hearing, rather than through prolonged discovery. A claimant who arrives with a clean infringement read and a defensible validity position is already most of the way to winning.

1. Confirm your patent is in force in Belgium (a validated European patent, a Belgian national patent, or a Unitary Patent).
2. Decide between the national Brussels court and the Unified Patent Court, and check any opt-out.
3. Secure evidence early, typically through a descriptive seizure before filing.
4. Choose your relief: a preliminary injunction, a cease-and-desist action, or a full merits claim.
5. File before the Brussels Enterprise Court in the correct language of proceedings.
6. Anticipate the near-inevitable nullity counterclaim and defend validity.
7. Enforce the judgment: injunction, damages, recall, destruction and publication.

The Brussels Enterprise Court Has Exclusive Jurisdiction

This is the single most important rule of patent litigation in Belgium. Under Article XI.337 of the Code of Economic Law, which took effect on 1 January 2015, the Brussels Enterprise Court (Ondernemingsrechtbank Brussel / Tribunal de l’entreprise de Bruxelles) holds exclusive national jurisdiction over patent disputes. No matter where the infringement occurs or where the parties are based, a Belgian patent case is heard in Brussels and nowhere else.

Appeals go to the Brussels Court of Appeal (Hof van Beroep Brussel / Cour d’appel de Bruxelles), and a final cassation appeal on points of law may reach the Court of Cassation. Because Brussels is officially bilingual, the case proceeds in either Dutch or French depending on the defendant and the language of the summons, so getting the language of proceedings right at the outset matters. Concentration in one court has produced a bench that, while not technically trained, is genuinely experienced in patents.

Belgium Is in Both the EPC and the UPC

Belgium is a member of the European Patent Convention, so you can obtain protection by validating a granted European patent here; for the mechanics see our guide to validating a European patent in Belgium. Belgium also ratified the Unified Patent Court Agreement, and a UPC local division sits in Brussels, operational since the Court opened on 1 June 2023. That gives a patentee a genuine choice of forum.

A classic (non-unitary) European patent validated in Belgium can be litigated either before the national Brussels Enterprise Court or before the UPC, unless the proprietor has opted the patent out of the UPC’s jurisdiction during the transitional period. A Unitary Patent can only be enforced at the UPC. The strategic question is reach: a UPC ruling covers every participating member state at once, while the Brussels court decides Belgium alone. For a Belgium-only problem, the national court is often faster and cheaper; for a pan-European campaign, the UPC may be the better front. If you are still deciding where to protect an invention first, our guide to how to file a patent in Belgium covers the routes.

Descriptive Seizure: Belgium’s Evidence Weapon

The descriptive seizure (saisie-description / beslag inzake namaak) is what makes patent litigation in Belgium distinctive, and it is one of the most powerful evidence tools in Europe. On an ex parte application under Article 1369bis/1 of the Belgian Judicial Code, the President of the Enterprise Court can authorise a court-appointed expert to enter the alleged infringer’s premises, without prior warning, and describe the suspected infringing products, processes and documents in detail.

To obtain one, the patentee must show a prima facie valid patent and indications that it is being infringed. The measure can be purely descriptive or, where stronger evidence justifies it, extend to actual seizure of infringing goods and the tools used to make them. Because it is granted before the defendant knows a dispute exists, the descriptive seizure lets a rights holder lock down proof of infringement that would otherwise disappear, then build the merits case on solid ground. It is the first move in most serious Belgian patent disputes.

Preliminary Injunctions and Cease-and-Desist Relief

Speed usually comes from interim relief. A patentee can seek a preliminary injunction in summary proceedings (kort geding / référé) before the President of the Brussels Enterprise Court, showing urgency and a sufficiently strong case. Where the infringement and validity are clear, this can stop a launch in weeks rather than the year a full merits action takes.

Belgium also offers a cease-and-desist action (action en cessation / stakingsvordering), a fast-track procedure on the merits of infringement that results in an order to stop, backed by penalty payments. It does not award damages, but it delivers a rapid, enforceable prohibition. Many rights holders combine an early descriptive seizure with a cease-and-desist or preliminary-injunction application to apply pressure quickly while the main damages claim proceeds in the background.

How Invalidity Is Raised, and Why Bifurcation Does Not Apply

A defendant in Belgium will almost always attack the patent. Invalidity is typically raised as a nullity counterclaim within the infringement action, or as a standalone revocation claim, and it can run in parallel with an EPO opposition or a UPC revocation action. Unlike the German system, Belgium does not bifurcate: the same court decides infringement and validity together, so a patent that cannot survive scrutiny will not carry an injunction.

That single-forum approach rewards claimants who have stress-tested their own patent before filing. A validated European patent that has already weathered opposition, or a national patent supported by a solid prior-art position, is far harder to knock out. Running a defensive invalidity review before you sue tells you whether the patent can bear the weight of the injunction you intend to seek.

Remedies You Can Realistically Obtain

A successful patentee in Belgium can expect a permanent injunction, an award of damages, an order to recall and destroy infringing goods, and publication of the judgment at the infringer’s expense. Damages are compensatory: they may be measured on the patentee’s lost profits or a reasonable royalty, and in cases of bad-faith infringement the court can order the infringer to surrender the profits it made.

Injunctions are commonly reinforced with a penalty payment (astreinte / dwangsom), a fixed sum for each day or each item of continued infringement, which gives the order real bite. What Belgium does not offer is US-style punitive damages, so set commercial expectations accordingly. The practical value of a Belgian judgment lies in the reliable injunction and the recall, not in an outsized damages figure.

Timing, Cost and Preparing to Win

How long does it take? A preliminary injunction or cease-and-desist order can arrive within weeks to a few months when urgency is genuine. A full merits action before the Brussels Enterprise Court typically runs 12 to 24 months to first-instance judgment, with an appeal adding further time. Belgian litigation is markedly cheaper than UPC or German proceedings, one reason patentees increasingly treat Belgium as a serious venue in a coordinated European enforcement plan.

Because the system is front-loaded, the case you file is largely the case you get. For a patentee that means a clear claim-mapping onto the accused product, a credible technical position, and a validity case that can survive the counterclaim. Ambiguous evidence or an untested patent will not be rescued by procedure. Before you commit to Brussels, pressure-test both infringement and validity: a short, honest assessment will tell you whether Belgium is the place to fight and how hard the other side can push back.

Build Your Belgian Patent Case With PerspireIP

PerspireIP supports patentees litigating before the Brussels Enterprise Court and the UPC with prior-art and invalidity searches, infringement claim charts and litigation-ready evidence. Explore our Belgium services hub, our patent invalidation search in Brussels and infringement analysis in Brussels, or contact us to scope a litigation strategy.

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