New Referral G 1/25 to the Enlarged Board of Appeal of the EPO
Must the description be adapted to amended patent claims?
Summary
On July 29, 2025, the Technical Board of Appeal of the European Patent Office issued an interlocutory decision in case T 697/22. In this decision, three questions were referred to the Enlarged Board of Appeal (EBA) to clarify whether the description of a European patent (or patent application) must be adapted to amended claims.
Background
The decision is based on appeals lodged by both the patent proprietor and the opponent against the first-instance decision in opposition proceedings. The Board concluded, in line with the Opposition Division, that the claims submitted as an auxiliary request were allowable. However, the proprietor had not filed an adapted description corresponding to these claims. The Board identified contradictions between the claims and the current description and rejected a later attempt to submit an amended description as inadmissibly late.
This raises the central issue: Do contradictions between amended claims and the description prevent the grant of a European patent?
Current practice
During examination, the EPO typically requires the description to be brought into conformity with amended claims. This practice is supported by long-standing case law, which holds that the description must be consistent with the claims. The legal basis cited varies, though reference is often made to Article 84 EPC, which requires claims to be clear and supported by the description (see, for example, T 1024/18).
However, recent Board decisions – most notably T 56/21 – have challenged this approach. According to these decisions, the EPC does not impose a strict requirement to adapt the description to amended claims, particularly if the claims are clear in themselves. In this view, examples in the description that fall outside the scope of the amended claims do not affect the clarity or support of the claims.
Referred questions
Given the divergence in recent case law and the relevance of the issue, the referring Board has put the following three questions before the EBA:
1. If the claims of a European patent are amended during opposition proceedings or opposition-appeal proceedings, and the amendment introduces an inconsistency between the amended claims and the description of the patent, is it necessary, to comply with the requirements of the EPC, to adapt the description to the amended claims so as to remove the inconsistency?
2. If the first question is answered in the affirmative, which requirement(s) of the EPC necessitate(s) such an adaptation?
3. Would the answer to questions 1 and 2 be different if the claims of a European patent application are amended during examination proceedings or examination-appeal proceedings, and the amendment introduces an inconsistency between the amended claims and the description of the patent application
All three questions ultimately seek to determine whether the description must be adapted to amended claims to eliminate inconsistencies.
Outlook
The EBA will first need to decide whether it intends to address all three questions, although only the answer to question 1 is directly relevant to the case at hand. Nevertheless, a different outcome in response to question 3 seems unlikely.
The decision will be of significant importance for applicants: adapting the description following claim amendments is often a time-consuming and costly exercise. It also carries the risk of negatively impacting the later interpretation of the patent before national courts, or limiting flexibility in subsequent validity proceedings.
Of particular interest will be how this referral aligns with the EBA’s recent decision G 1/24 (see our article). According to that decision, the description and drawings must always be taken into account when interpreting patent claims—even during examination and opposition proceedings. This gives renewed prominence to the role of the description and may lead to a more critical assessment of inconsistencies between the claims and description.
We will continue to monitor developments and are happy to advise on the best approach in light of this evolving legal landscape.






