Infringement Analysis in London.

Patent infringement analysis London strategy turns on a fact many overlook: post-Brexit the United Kingdom sits outside the Unified Patent Court and the unitary patent, so a UK patent — or the UK designation of a European patent — is enforced nationally in the English courts, never centrally at the UPC in Paris or Munich. That makes London its own arena, with its own claim-construction rules, its own product-and-process-description procedure and its own single trial of infringement and validity together. London is also the global capital of FRAND and standard-essential-patent rate-setting. Whether you are a patentee asserting rights or an accused party building a non-infringement case, PerspireIP delivers claim charts and evidence-of-use tuned to how the English courts actually decide.

Why patent infringement analysis London work is decided nationally, not at the UPC

Since Brexit the United Kingdom has confirmed it will not join the Unified Patent Court (UPC) or the unitary patent system. For anyone weighing a UK dispute, that single fact reshapes the strategy. There is no unitary patent covering Britain, and a UPC judgment does not settle infringement of a UK right. Instead, UK protection exists as national patents granted by the UK Intellectual Property Office and as European patents (UK) — the UK designations of European patents granted by the EPO, which the UK still hosts as a Contracting State to the European Patent Convention.

The practical consequence is jurisdictional. To enforce a UK right, or to defend against one, the fight happens in the English courts — principally the Patents Court and the Intellectual Property Enterprise Court — applying English law on claim construction and infringement. A parallel EU dispute at the UPC decides nothing for Britain, and a European patent is treated as a bundle of national rights the moment it is litigated here.

So a sound patent infringement analysis London plan is built to English standards from the outset: claims mapped element by element against the accused product or process, and evidence-of-use assembled for a court the UK never left the EPC to reach. The forum, the procedure and the proof are all distinctly British.

• The UK is not in the UPC or the unitary patent — UK rights are enforced nationally
• UK rights = UKIPO national patents plus European patents (UK) validated via the EPO
• A UPC judgment does not resolve infringement of the UK part of a patent
• English claim-construction law, not UPC or German practice, governs the analysis

Where a London patent case is decided: the Patents Court and IPEC

London offers two front-line forums for patent infringement, and choosing between them is a strategic decision on its own. The Patents Court is part of the High Court (Chancery Division) and sits within the Business and Property Courts at the Rolls Building on Fetter Lane. It hears the most complex and highest-value patent disputes, has no cap on recoverable costs, and is where bet-the-company technology and pharmaceutical cases are fought. Appeals run to the Court of Appeal and, with permission, to the UK Supreme Court.

The Intellectual Property Enterprise Court (IPEC), also in the Rolls Building, is designed for smaller and mid-sized disputes. Its multi-track caps recoverable costs at £60,000 for the liability stage and £30,000 for quantum, and limits damages to £500,000. A separate IPEC small-claims track handles suitable claims worth up to £10,000. For an SME asserting a patent, or an accused start-up wanting predictable exposure, that cost certainty is often decisive.

Both courts decide infringement on the same legal principles, so the analytical work is portable between them. What changes is scale and budget. A rigorous patent infringement analysis London engagement is built to feed whichever forum fits the value and complexity of the dispute, and to survive the tighter procedural discipline that IPEC imposes.

• Patents Court — High Court (Chancery Division), Rolls Building; no costs cap; complex, high-value cases
• IPEC multi-track — costs capped at £60,000 (liability) and £30,000 (quantum); damages capped at £500,000
• IPEC small-claims track — claims up to £10,000, for the simplest disputes
• Appeals — Court of Appeal, then the UK Supreme Court with permission

How UK infringement is proven: claim construction after Actavis v Eli Lilly

English infringement analysis begins with claim construction, and the law shifted decisively in 2017. In Actavis v Eli Lilly [2017] UKSC 48 the Supreme Court introduced a doctrine of equivalents into UK patent law, moving beyond the purely purposive construction that had governed since Kirin-Amgen. Infringement is now tested in two stages: first, whether the accused product or process falls within the claim on its normal interpretation; and if not, whether it nonetheless infringes because it varies from the invention in an immaterial way.

The equivalents limb applies a reformulated set of questions — the Actavis questions — asking whether the variant achieves substantially the same result in substantially the same way, whether that would be obvious to a skilled reader, and whether strict compliance with the wording was nevertheless intended. This matters enormously to both sides. A patentee can capture variants that dodge the literal wording; an accused party must show its design-around is a material, not immaterial, departure.

Good claim charts therefore run two tracks in parallel: a literal, element-by-element mapping and a separate equivalents analysis. PerspireIP builds both, so a patent infringement analysis London file addresses normal interpretation and the doctrine of equivalents the way an English judge will, rather than importing US or German assumptions that no longer fit.

• Stage one — normal interpretation: does the accused product fall within the claim wording?
• Stage two — equivalents: is any difference an immaterial variant under the Actavis questions?
• Charts map every claim integer to the accused product or process, literally and by equivalence
• File history and prosecution estoppel are weighed the English way, not the US way

The Product and Process Description and the single infringement-and-validity trial

Two features of English procedure shape how evidence-of-use is built. First, the accused infringer usually does not give conventional documentary disclosure on infringement. Instead, under Practice Direction 63, a defendant may serve a Product and Process Description (PPD) — a full, signed statement giving the relevant particulars of the accused product or process, with drawings where needed. The PPD must be full and frank, including matter that is detrimental, and it becomes the factual spine against which the claim is read.

For a patentee, that means the infringement case is often decided on the four corners of the PPD, so the claim chart has to interrogate it precisely and flag every gap or ambiguity. For an accused party, drafting a PPD that is accurate yet does not concede the claim is a delicate exercise where an infringement analysis pays for itself. Get the PPD wrong and the consequences are serious.

Second, unlike bifurcated systems such as Germany, the English courts try infringement and validity together in a single trial. A defendant almost always counterclaims for revocation, so the same evidence must serve a coordinated infringement-and-validity strategy. A well-built patent infringement analysis London file dovetails with the prior-art record, because the way a claim is construed to catch the defendant can be the very construction that renders it invalid — the classic squeeze.

• PPD — the accused party serves particulars of its product or process in lieu of infringement disclosure
• The PPD must be full and frank; errors carry real litigation consequences
• Infringement and validity are tried together, not split as in Germany
• Beware the squeeze: a broad construction that catches the defendant can also invalidate the claim

London: the global capital of FRAND and standard-essential-patent rate-setting

No court in the world has done more to shape standard-essential-patent (SEP) litigation than the English Patents Court. In Unwired Planet v Huawei [2020] UKSC 56 the Supreme Court confirmed that an English court, having found a UK SEP infringed, can settle the terms of a global FRAND (fair, reasonable and non-discriminatory) licence as the price of avoiding an injunction. That turned a single UK infringement finding into the gateway to a worldwide licence, and it made London the venue of choice for telecoms and connectivity disputes.

The line of authority has kept building. In InterDigital v Lenovo the Patents Court set a global FRAND rate, and on appeal in July 2024 the Court of Appeal revised the figure upward; in Optis v Apple [2025] EWCA Civ 552 the Court of Appeal again increased the rate the High Court had set, and the Supreme Court is due to hear further SEP appeals in 2026. The English courts have also developed interim-licence declarations to keep implementers licensed while rates are fixed.

SEP disputes still begin with technical infringement and essentiality: a patent counts toward a FRAND portfolio only if it truly reads on the standard. That is where forensic claim charts against the relevant 3GPP or ETSI specification decide the case. A patent infringement analysis London engagement for a SEP matter maps the asserted claims to the standard clause by clause, for the patentee proving essentiality or the implementer challenging it.

• Unwired Planet v Huawei — English courts can set a global FRAND rate off a single UK infringement
• InterDigital v Lenovo and Optis v Apple — the Court of Appeal has recalibrated FRAND rates upward
• Interim-licence declarations keep implementers licensed pending a rate determination
• Essentiality turns on charting claims against the ETSI or 3GPP standard, integer by integer

Life sciences, fintech, AI and creative: London’s infringement battlegrounds

London concentrates the industries that generate the sharpest infringement fights. Life sciences leads: the Rolls Building sees a steady stream of pharmaceutical and biotech disputes over dosage regimens, formulations, second-medical-use claims and biosimilars, frequently entangled with supplementary protection certificates. The English courts even developed the Arrow declaration — a declaration that a product was obvious or anticipated at a priority date — to let a generic or biosimilar clear the way through a thicket of pending divisionals, though such relief remains rare and hard-won.

Around life sciences sit the capital’s other patent-rich sectors. Fintech and finance drive disputes over payments, trading and security technology; the fast-growing AI and machine-learning cluster raises novel infringement and subject-matter questions; and creative-technology and media businesses litigate over codecs, streaming and content tools. Each field carries its own evidence-of-use challenge, from reverse-engineering a device to reading a cloud service or an API you cannot inspect directly.

That variety is why a credible patent infringement analysis London provider has to reach beyond patent databases. Proving use of a formulation, a fintech protocol or an AI pipeline draws on regulatory filings, technical standards, product teardowns, source-code and specification evidence, archived web pages and marketing materials — all dated to the moment that matters and marshalled into a chart a Patents Court or IPEC judge can follow.

• Life sciences — dosage, formulation, second-medical-use and biosimilar disputes, plus Arrow declarations
• Fintech and finance — payments, trading and security-technology infringement
• AI and machine learning — novel infringement and patent-eligibility questions
• Creative and media technology — codecs, streaming and content-platform claims

How PerspireIP builds a patent infringement analysis London engagement

Every engagement starts by fixing the claim and the target. We construe the asserted claims, break each one into its integers, and identify precisely what has to be proved — for a patentee, that the accused product or process meets every element; for an accused party, that at least one element is missing on both normal interpretation and the doctrine of equivalents. We then gather evidence-of-use from the sources the technology demands and build a claim chart an English court, or a PPD-drafting opponent, can be tested against.

• Claim charting that maps every integer to the accused product, literally and by equivalence
• Evidence-of-use retrieval: teardowns, source and specification evidence, regulatory and standards documents
• Essentiality mapping against ETSI or 3GPP standards for SEP and FRAND matters
• PPD review and pressure-testing for both asserting and accused parties
• A coordinated infringement-and-validity view for the single English trial, including squeeze analysis
• A written opinion and exhibit-ready reference packages built to Patents Court and IPEC deadlines

We work as a specialist search-and-analysis partner alongside your English solicitors, barristers and patent attorneys, and we are equally at home on either side of the dispute. For a patentee we build the offensive claim chart and evidence-of-use that support an assertion or a FRAND portfolio; for an accused party we stress-test the case, find the missing integer and shape the non-infringement or squeeze position. Everything is confidential and scaled to the matter — a single opinion, a multi-patent SEP campaign or ongoing support.

Send us the patent number, the accused product or standard, and your key dates, and we will scope a patent infringement analysis London project within one business day. Whether the venue is the Patents Court, IPEC or a global FRAND rate-setting trial, you get an analysis built for how London actually decides.

IP Landscape & Resources in London

Key intellectual-property authorities and venues relevant to London:

• UK Intellectual Property Office (UKIPO) — the UK government body that grants national patents and issues non-binding infringement and validity opinions through its tribunal
• The Patents Court (Business and Property Courts) — the specialist High Court (Chancery Division) forum at the Rolls Building that decides complex UK patent infringement and validity, including global FRAND rates
• Intellectual Property Enterprise Court (IPEC) — the streamlined London court for SMEs, with capped recoverable costs and a damages cap for smaller patent disputes
• European Patent Office (EPO) — grants European patents whose UK designations are enforced in the English courts, and hears post-grant oppositions affecting those UK rights

Request a Patent Infringement Analysis in London

Explore related PerspireIP services: Patent Infringement Analysis · Prior Art Litigation Search · Patent Invalidation.

Frequently Asked Questions