Patent Litigation in Germany: 5 Essential Rules Before You Sue

Germany hears more patent cases than any other country in Europe, and since the Unified Patent Court opened its doors in June 2023 the choices facing a patent owner have only multiplied. If you hold a European patent and someone is infringing it on the continent, patent litigation in Germany is almost always on the table – and getting the venue, the timing and the injunction strategy right is what separates a decisive win from an expensive stalemate. This guide walks through the five rules that decide how a German patent case really plays out.

What Patent Litigation in Germany Really Looks Like

Patent litigation in Germany is fast, specialised and, by international standards, remarkably affordable. Cases are decided by experienced patent judges rather than juries, first-instance infringement rulings typically arrive within about twelve months, and the loser pays a large share of the winner’s statutory costs. That combination is why Germany accounts for a huge slice of all European patent disputes and why it is the venue foreign patentees reach for first.

Since 2023 a patent owner effectively has two forums to choose from: the long-established German national courts and the new Unified Patent Court (UPC), whose busiest local divisions sit on German soil. Understanding how the two systems differ – and where they overlap – is the starting point for any enforcement plan. If you have not yet secured protection in the country, our guide to validating a European patent in Germany covers the step that comes before enforcement.

Rule 1: Germany Splits Infringement and Validity (Bifurcation)

The single most important feature of national German practice is bifurcation. Infringement is decided by a civil regional court (Landgericht), while the question of whether the patent is valid is sent to a completely separate court – the Federal Patent Court (Bundespatentgericht) in Munich – in a parallel nullity action.

Because the two tracks run on different clocks, the infringement court often rules before the validity court does. That creates the famous “injunction gap”: a patentee can win an injunction and enforce it while the defendant’s challenge to the patent is still pending. For a patent owner that is a powerful lever; for an accused infringer it is a reason to move quickly on validity and to weigh a licence or settlement early.

• Infringement -> regional court (Landgericht), e.g. Dusseldorf, Mannheim or Munich
• Validity / nullity -> Federal Patent Court (Bundespatentgericht), Munich
• Second instance -> Higher Regional Court (infringement) and the Federal Court of Justice (BGH)

Rule 2: Where You Sue – Regional Courts and the UPC

Three regional courts hear the overwhelming majority of national cases – Dusseldorf, Mannheim and Munich – each with dedicated patent chambers and a distinct reputation for pace and patentee-friendliness. You can generally sue wherever the infringing product is offered, which gives a claimant real freedom to forum-shop within Germany.

Layered on top is the Unified Patent Court. Its German local divisions in Munich, Dusseldorf, Mannheim and Hamburg together handle well over half of all UPC filings, and a UPC ruling covers every participating EU country at once – not just Germany. The catch is scope: the UPC hears European patents that have not been opted out and the new Unitary Patent, while classic national German patents and opted-out European patents stay in the national courts. When you are enforcing against activity that spans several cities, our infringement analysis in Dusseldorf and infringement analysis in Munich teams map the exposure before a complaint is filed.

Rule 3: The Injunction and the 2021 Proportionality Reform

A German infringement injunction has historically been close to automatic – prove infringement of a valid patent and the court orders the defendant to stop. That remains the default, but a 2021 amendment to Section 139 of the Patent Act added an explicit proportionality safeguard, allowing a court to temper or delay an injunction in the rare case where immediate enforcement would be grossly disproportionate to the patentee and to third parties.

In practice the courts have applied the exception narrowly, so a patent owner should still plan around a real injunction risk, while a defendant in a complex-product industry – automotive, telecoms, semiconductors – now has a genuine, if slim, argument to raise. It is a factor to model, not a shield to rely on.

Rule 4: Timelines, Costs and the “Loser Pays” Rule

Speed is Germany’s calling card. A first-instance infringement decision commonly lands in roughly twelve months, and the Federal Patent Court now issues an early preliminary opinion on validity within about six months of a nullity action – guidance the infringement court can factor in.

Costs are driven by the “value in dispute” the court sets, and the losing party reimburses a statutory share of the winner’s court and attorney fees. Compared with the seven-figure budgets routine in US litigation, German patent cases are strikingly economical, which is another reason claimants favour the venue. For a cross-border comparison, see how enforcement differs in our guide to patent litigation in the United Kingdom.

Rule 5: Choosing Between the National Courts and the UPC

The strategic question in almost every case is now national court or UPC. The UPC offers pan-European reach from a single action – ideal when infringement is spread across the EU – but it also puts the patent’s validity at risk everywhere at once, because a central revocation kills the patent in all participating states. The national route confines both the win and the loss to Germany, and keeps the tactical advantage of bifurcation.

Many patentees hedge: they opt sensitive patents out of the UPC and enforce nationally, while using the UPC for others. The right answer depends on the size of your German market, the strength of the patent and your appetite for an all-or-nothing outcome. If you are still building the portfolio, our walkthrough of how to file a patent in Germany explains the routes in. You can also see the full range of enforcement support on our Germany services hub.

Whichever forum you pick, the case is won on preparation – a clean claim chart, a defensible validity position and evidence gathered before the defendant sees it coming. Authoritative background on the unitary system is published by the Unified Patent Court, and the national nullity forum is the German Federal Patent Court.

If You Are the Accused Infringer: Defence Options

Because the injunction risk in Germany is real and fast, a defendant cannot afford to wait. The most effective response is usually a two-front strategy: contest infringement in the regional court while attacking the patent’s validity in a nullity action at the Federal Patent Court. A strong, well-documented invalidity position – built on prior art the examiner never saw – is what narrows the injunction gap and brings the other side to the table.

Speed and evidence decide these cases. Filing the nullity action early triggers the Federal Patent Court’s preliminary opinion sooner, and that opinion often reshapes the settlement dynamic. Whether you are asserting or defending, the raw material is the same: a rigorous prior-art search, a precise claim-construction analysis and a clear infringement or non-infringement read. Those are exactly the deliverables that turn a German patent dispute your way, and they need to be ready before the first hearing rather than assembled during it.

Enforce – or Defend – With Confidence in Germany

Whether you are asserting a European patent or defending against an injunction, PerspireIP delivers the prior-art searches, invalidity analysis and claim charts that German patent litigation turns on. Talk to our team about your matter.

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