EPO Enlarged Board limits mandatory description amendments in G 1/25

Context: The European Patent Office (EPO) has long required applicants and patent proprietors to bring descriptions into line with amended claims, often by deleting or identifying embodiments that are no longer covered. The Boards of Appeal, however, disagreed over whether the European Patent Convention (EPC) actually required this. Some decisions treated consistency between the claims and description as necessary under Article 84 EPC, while others found no legal basis for requiring amendments simply because the description contained subject matter that was no longer claimed. The Enlarged Board of Appeal (EBA) was asked to resolve that divide.

What’s new: In G 1/25, the EBA held that amended claims do not automatically require corresponding changes to the description. Adaptation is necessary only where the mismatch creates a genuine inconsistency and that inconsistency causes non-compliance with a specific requirement of the EPC. The decision also confirms that claims must be interpreted together with the description and drawings, rather than in isolation.

Direct impact: Applicants and patent proprietors should have stronger grounds to resist generic EPO requests to amend the description simply because it no longer mirrors the claims. The EPO will need to identify a genuine inconsistency and explain which EPC requirement is affected before adaptation can be required. This should reduce purely formal amendments, while making the remaining mandatory changes more closely tied to substantive issues such as clarity, novelty or inventive step.

Wider ramifications: G 1/25 may make the reasons behind description amendments more important after grant. Since mandatory changes must now be tied to a specific EPC deficiency, the prosecution record could attract greater attention in later disputes over claim scope before national courts or the UPC. The decision does not determine what weight those courts should give to such amendments, and EBA case law is not binding on those courts, but it strengthens the description’s role in claim interpretation while leaving open how concepts such as “real doubt” and a “readily” resolvable inconsistency will be applied in future cases.