Novelty Assessment: An EPC Patentability Search Guide

Core standards for novelty assessment

Review the legal definition

Under EPC Article 54, an invention is new if it does not form part of the state of the art. Article 54(2) covers everything made available to the public before the filing date through written or oral description, use, or any other way. A valid priority claim may change the relevant date for entitled subject matter. Article 54(3) additionally addresses the content of certain earlier-filed European patent applications published on or after that date.¹

The central question is narrower than whether a document looks similar. The reviewer asks whether the claimed subject matter, with all limiting features and relationships, was made available in one qualifying prior-art disclosure. Eureka IP Search’s Novelty Search extracts core technical features, builds multiple search strategies, and compares close prior art feature by feature.² Its output supports evidence review; it does not determine the governing law or replace qualified professional judgment.

Determine what the reference actually discloses

The EPO test is not a free-standing comparison of technical field, problem, solution, and expected effect. Those categories may help organize an invention, but novelty turns on the claimed features and what the skilled person can derive directly and unambiguously from the prior-art disclosure.

The technical solution usually supplies the main comparison units. Differences in stated problem or effect do not establish novelty if the same limiting technical features are already disclosed. Conversely, broad thematic similarity does not defeat novelty when at least one limiting feature or required relationship is not disclosed.

Novelty assessment and the single-document principle

What single-document comparison permits

For novelty, separate items of prior art cannot be combined. The whole content of one document may be considered, not only its abstract or examples. However, separate embodiments within that same document cannot be combined unless the document specifically suggests the combination.³

Accordingly, the reviewer may read connected claims, description passages, examples, and drawings together when they form one disclosure. The reviewer should not select feature A from one embodiment and feature B from an unrelated embodiment merely because both appear somewhere in the document. Cross-document combinations belong, if relevant, to inventive-step analysis rather than novelty.

Implicit disclosure within one reference

Implicit disclosure counts only when the feature is directly and unambiguously derivable from the document. The EPO Guidelines give the example of rubber used in circumstances that clearly rely on elasticity: the elastic property is implicit even if the word “elastic” is absent.⁴

For an aluminum-alloy heat sink, electrical conductivity should be treated as implicit only if the material, condition, and claimed level of conductivity make that conclusion necessary for the skilled person. Likewise, a heat-treatment effect is implicit only if the disclosed process conditions inevitably produce it. If further choices, testing, or modification are required, the feature is not directly and unambiguously disclosed.

A rubber composition containing component A does not necessarily disclose “excellent tear resistance.” That result depends on the full composition, processing, test method, and claimed threshold. Experimental data can be relevant evidence, but an asserted effect should not be inferred from one ingredient alone.

Common novelty assessment scenarios

Scenario 1: generic and specific concepts

The EPO Guidelines state that a specific disclosure takes away the novelty of a generic claim including it, while a generic disclosure usually does not take away the novelty of a specific example.⁵

Scenario 2: numerical ranges

Under the 2026 EPO Guidelines, a claimed subrange is not novel if a specific prior-art value, including an endpoint, lies within it. Otherwise, novelty depends on the circumstances, including whether the subrange is narrow, sufficiently far from specific examples, and directly and unambiguously derivable. The skilled person’s serious contemplation of working in the selected subrange also matters.⁶

Scenario 3: open-ended and closed-ended claims

A claim using “comprising” includes the stated features without excluding additional features that do not make the claimed subject matter unworkable. Therefore, a prior-art embodiment can anticipate such a claim even if it contains extra components. By contrast, “consisting of” excludes further features beyond those stated.⁷

Apply this distinction to the full claim. Extra prior-art material does not automatically avoid anticipation of an open claim, while an additional component may matter to a closed composition claim. Terms such as “consisting essentially of” require their own contextual construction.

Scenario 4: novelty of use claims

For an ordinary product claim, a new intended use usually does not make an otherwise known product new unless the stated purpose implies a distinguishing form or technical feature. The claim wording and category therefore matter.

The EPC contains specific rules for first and further medical uses of substances or compositions. A known substance may still be patentable for a first medical use, or for a specific further therapeutic use, if the statutory conditions are met and the use is novel and inventive.⁸ For a second non-medical use, a new technical effect can act as a functional technical feature when that effect has not previously been made available to the public; discovering a new property of an otherwise known production process does not automatically make that process new.⁹

During a patentability search, identify the claim category, exact use limitation, prior public use, and jurisdiction-specific claim format before reaching a conclusion.

Does direct replacement by a customary means defeat novelty?

Under the EPO framework, a well-known equivalent that the document does not disclose should not be imported into the reference for novelty. The Guidelines expressly place that question under obviousness.⁴

Therefore, if the prior art uses a screw and the claim requires a bolt, do not conclude that novelty fails merely because the two may be familiar fastening alternatives. First ask whether the document directly and unambiguously discloses the claimed bolt, a broader fastening concept that reads on the claim, or an embodiment necessarily using it. If not, the substitution may still be obvious, but that is a separate inventive-step inquiry.

The same discipline applies to a spring and a pneumatic actuator. Different operating principles may strengthen the distinction, yet novelty still depends on the claim and the reference—not on an informal judgment that the alternatives are more or less customary.

Common errors in novelty assessment

Error 1: relying only on keyword matching

The absence of the word “graphene” does not prove novelty if a reference directly and unambiguously describes the same material using accepted technical language. However, a loose synonym or functional resemblance is not enough. Confirm identity from the reference and reliable technical meaning.

Error 2: treating a better effect as an automatic basis for novelty

A markedly better result does not by itself establish novelty when the claim contains the same technical features as the prior-art disclosure. Evidence of an effect may matter to claim construction, enablement, inventive step, or a properly framed use claim, but it cannot replace a missing structural or functional limitation.

Error 3: neglecting dependent claims

Dependent claims include all features of the claims on which they depend. If an independent claim is novel, its dependent claims are also novel. If the independent claim lacks novelty, the dependent claim still requires review because its additional limitations may distinguish it. EPO search guidance also directs the search to cover dependent claims.¹⁰

Error 4: using an overall impression instead of feature mapping

“The inventions feel different” is not a reviewable conclusion. Identify the limiting feature or relationship that is missing, cite the reference passage, and record why any proposed implicit disclosure is necessary rather than merely possible.

An operational workflow for novelty assessment

1. Fix the relevant claim and date. Identify the claim version, filing date, and any priority entitlement that may apply.
2. Build the feature list. Preserve structural, functional, material, process, range, and relationship limitations.
3. Read the whole relevant disclosure. Review connected claims, description passages, examples, and drawings—not only the abstract.
4. Map each feature. Record explicit disclosure, necessary implicit disclosure, no disclosure, or a potential match needing support.
5. Keep embodiments separate. Combine passages only when the document teaches the combination.
6. Reach a preliminary result. If one disclosure makes every limiting feature available, the claim may lack novelty. If it does not, proceed to inventive-step analysis without calling the claim patentable overall.

Before this assessment, Eureka IP Drafting’s Invention Disclosure workflow can turn rough engineering notes into a structured disclosure and highlight missing details or overlooked inventive points.¹¹ This adjacent workflow helps define what needs to be assessed; it does not decide whether a prior-art document anticipates a claim.

Key takeaway

Novelty assessment under the EPC compares the claim with one prior-art disclosure. The reviewer considers the whole taught content but may not assemble unrelated embodiments or import undisclosed equivalents. Generic and specific concepts, numerical ranges, claim-transition language, use claims, implicit features, and dependent claims each require their own disciplined analysis.

The practical core is feature-by-feature evidence: what the claim requires, where the reference discloses it, and why any implicit feature is directly and unambiguously derivable. A preliminary novelty result is one part of patentability assessment, not a final opinion on validity, infringement, or freedom to operate.