When the claim covers only part of the range: what it costs to be wrong
A claim written for one segment of a technical range protects only that segment. A competitor working outside the stated numbers, ratios or composition does not infringe, whatever the underlying idea was. Being wrong here costs twice: once through an invalidity attack against a claim drafted too wide, once through a design-around that a claim drafted too narrow cannot stop.
The basis
Where the patent in dispute is a European patent with unitary effect, infringement and validity are decided together, in one forum, under the Agreement on a Unified Patent Court. The scope defined by the claim — including any partial range within it — is the only scope that forum will enforce or invalidate. Nothing wider survives, and nothing narrower is added back in.
The unitary regime itself rests on Regulation (EU) No 1257/2012 and, for the language version in which the claim is drafted and read, on Council Regulation (EU) No 1260/2012. A claim that states one range in the language of the proceedings and a different range in a translation carries that mismatch into every later dispute over scope.
Where enforcement runs through customs rather than a court, Regulation (EU) No 608/2013 governs how customs authorities act on an application for action. Customs compares the seized goods to the scope stated in that application, not to the invention as its owner remembers it.
What changes in practice
Two failure modes sit inside one situation, and they pull in opposite directions.
| Position of the stated range | What is exposed | Cost of being wrong |
|---|---|---|
| Narrower than the actual invention | A competitor operates just outside the stated boundary | No infringement finding; the design-around stands |
| Broader than the actual invention | Prior art already sits inside the stated range | Revocation risk for the whole claim, or for the part that overlaps |
| Stated inconsistently across language versions | Translation mismatch under the applicable translation regulation | Scope argued down to the narrowest reading available |
None of these three failure modes is corrected by better argument at the hearing. They are corrected earlier, by checking the range against the product and against the prior art before a dispute forces the comparison.
What to do
- You compare the claim as filed against the accused product or process, boundary by boundary, before instructing counsel on strategy.
- Your patent attorney maps every prior-art reference already on file against the stated range, not against the invention as it was originally described.
- If the patent has unitary effect, your legal team checks the claim text in the language version that will actually be enforced, not only the drafting language.
- Where enforcement will run through customs, your counsel prepares the application for action using the same range wording the claim itself uses.
- You identify which deadline is already running before drafting any substantive response — see the next section.
Who decides
For a European patent with unitary effect, the Agreement on a Unified Patent Court designates the Unified Patent Court as the forum for both infringement and revocation actions. One panel hears the scope argument and the validity argument together, on the evidence the parties file at each procedural stage.
For enforcement through customs, the decision on whether seized goods fall inside the stated range sits with the customs authority that received the application under Regulation (EU) No 608/2013. That is a customs decision, reviewable through the channel that regulation sets out — it does not itself settle validity.
If your situation is different
If the invention was developed by a team working across several jurisdictions, ownership of the underlying result may need settling before scope even becomes the question — see When the team is spread across three countries and.
If the rights in question were transferred through a tokenised structure rather than a conventional assignment, a different chain-of-title problem arises first — see When a transfer on-chain is not recorded off-chain step.
If the patent is not unitary but a bundle of national patents, each national court applies its own procedural rules to the same range, and a favourable reading in one jurisdiction does not carry over to another.
Related situations
A competitor filing next to your product raises a related but distinct problem, worth reading alongside this one: Who decides and when in this situation in practice.
Sources and limit
This page does not construe your claim. Claim construction depends on the specific wording, the prosecution file and the technical field, and none of that can be assessed in the abstract. What this page sets out is the forum, the governing framework and the sequence of steps that apply once a range dispute exists.
Where the dispute also touches a counterparty relationship — a developer, a licensee, a co-owner — the scope question and the counterparty question are usually assessed together rather than in sequence: Counterparty report before appointing a developer and the deadline.
Checked: the acts cited above are current as of the dates recorded for each in the register — Regulation (EU) No 608/2013, Regulation (EU) No 1257/2012, Council Regulation (EU) No 1260/2012, and the Agreement on a Unified Patent Court. No case is cited because none in the register carries a confirmed status for this scenario. For related contractual terms, see Data processing agreement: template and the deadline.
Frequently asked questions
What is the first step when the claim covers only part of the range?
Compare the claim boundary to the product or process at issue, term by term, before framing any argument about infringement or validity. The comparison decides which failure mode you are dealing with, and the two require opposite arguments.
Which deadline is already running?
A procedural deadline starts from a defined trigger — service of a claim, publication of grant, or discovery of the competing product — and it is set by the rules of whichever forum is handling the dispute, not by your own assessment timeline. Identify the trigger date before calculating anything else.
Who decides, and on what evidence?
For a European patent with unitary effect, the Unified Patent Court decides both infringement and validity, on technical evidence and prior art filed by the parties. For a bundle of national patents, each national court decides separately on its own procedural rules and its own evidentiary record.