Related family members can retain, narrow, broaden, or add claim features as prosecution moves across jurisdictions. Using a steel-composition family as a worked example, this article explains how to compare verified US, EP, and JP claim text while keeping claim construction and legal conclusions outside the Skill output.
The example compares Claim 1 from verified US, EP, and JP grants in one simple family. It shows the most important text differences while keeping legal interpretation outside the Sample.
Steel composition claims across three family members
These differences identify where jurisdiction-specific review should focus. They do not establish legal scope.
| Claim feature | US grant | EP grant | JP grant |
|---|---|---|---|
| Carbon | 0.06–0.16% | 0.06–0.16% | 0.06–0.35% |
| Silicon | 0.01–0.22% | 0.01–2.00% | 0.01–2.00% |
| Nickel | >0.40–3.00% | >0.40–2.00% | >0.40–3.00% |
| Additional limitation | Nb excluded | Nb optional | Bainite area fraction ≥85% |
JP values use a working English rendering of the original-language claim.
Choose the jurisdiction module that matches each claim set.
What a cross-jurisdiction claim comparison should contain
Start with a verified family map, then identify the exact publication or grant, claim number, claim version, language source, and evidence cut-off for every jurisdiction. Missing members or procedural records should remain unavailable rather than being inferred from another family member.
The useful deliverable is a feature matrix linked to the reviewed claim text. It should distinguish shared limitations from changed numerical ranges, added elements, deleted elements, and translation uncertainty.
Why related family members still require separate review
Family membership shows a filing relationship; it does not prove equivalent claim text or legal effect. Amendments, national practice, granted-versus-pending status, and translation can all change what appears in the comparison.
For this Sample, the visible result is deliberately limited to Claim 1. A full legal review would also need the relevant prosecution record, current status, dependent claims, specification support, and the authority applicable to the decision date.
When to use the jurisdiction Skills together
Use the US, EP, and Japanese claim-review Skills together when one patent family must be compared across those jurisdictions. Start from the available family members, review the authoritative material for each jurisdiction, and then align only comparable technical features in the final matrix.
The optional Korean check is recorded separately. Its missing member does not make the completed US–EP–JP comparison partial.
Prepare, install, and run
Provide the seed publication, jurisdictions, claim numbers, purpose, evidence cut-off, and any prosecution or translation materials already available. Select the US, EP, or Japanese module that matches each claim set; one jurisdiction’s rules should not silently substitute for another.
Compare Claim [number] across the verified US, EP, and JP members related to [seed publication]. Preserve every publication or grant identifier, claim version, language source, unavailable member, and feature difference. Separate text comparison from legal interpretation, and identify the records a qualified jurisdiction-specific reviewer must check next.How to use the comparison
Review next: confirm the controlling claim version, prosecution history, specification support, and Japanese translation before relying on the matrix.
The comparison identifies textual differences. It does not determine claim construction, validity, enforceability, infringement, or freedom to operate. The responsible jurisdiction-specific reviewer determines the procedural and legal significance.
An optional Korean family check returned no corresponding member; that availability check sits outside the completed US–EP–JP comparison.
Continue from comparison to focused claim review
Explore additional Skills when the next step requires a different jurisdiction, evidence package, or patent-analysis workflow.
Frequently asked questions
Why is the Korean comparison unavailable?
The reviewed simple, INPADOC, and Patsnap family sets did not return a Korean member. The workflow keeps that state visible instead of inferring Korean claim language from another jurisdiction.
Does a changed numerical range prove different legal scope?
No. The matrix shows text differences. Legal effect depends on the controlling claim, procedural history, applicable authority, and qualified jurisdiction-specific interpretation.
Is the Japanese column a certified translation?
No. The ranges were extracted from the original Japanese claim and rendered in English as a working comparison. Validate the language before relying on it for a legal decision.
Do I need a patent-data connection?
No connector is required when authoritative claim sets and supporting materials are supplied. Patent Briefing is useful when the workflow must retrieve or cross-check identified publications and family records.