Key points
- The OD revoked the patent. The proprietor appeals.
- The proprietor submits a test report D22 with the SoG. D22 is filed to support its earlier test report D21, which the proprietor had filed in the procedure before the OD.
- The Board, in translation: "D21 was filed in due time, albeit on the last day of the time limit set by the Opposition Division in the summons to oral proceedings for the filing of written submissions and/or documents (see EPO Form 2310Z of 29 January 2024) [*]. In light of this, it is understandable that the Opposition Division first formulated its criticism of D21 in the contested decision. Therefore, the filing of D22 with the statement of grounds of appeal constitutes a direct response to the contested decision."
- *: Compare T 0712/24.
- D22 is admitted.
- The opponent/respondent replied with a test report D23. "Although D23 was not filed together with Respondent 2's reply to the appeal, it was filed shortly thereafter (see Sections VII and VIII: 7 August 2025 vs. 10 September 2025). The Board therefore considers D23 to be an immediate response to the filing of D22."
- D23 is admitted.
- The opponent submitted D24 (standard DIN EN 1943:2002) after the Board issued its preliminary opinion.
- "Since D24 is expressly mentioned in both the patent in suit and granted claim 15, the Board further considered that the content of D24 – despite its filing at a very late stage of the proceedings – must have been known to the appellant. Its admission could therefore not have surprised her. In light of these exceptional circumstances, the Board did not consider it justified to disregard D24 under Article 13(2) of the Rules of Procedure of the Boards of Appeal."
- The opponent also filed D25, at the same time as D24, i.e., after the preliminary opinion.
- "D25 is a book excerpt on photoinitiators for acrylates"
- "in the Board's view, evidence relating to general technical knowledge is subject to the same provisions that apply to the admissibility of other evidence. The question, which was controversially discussed between the parties during the oral proceedings before the Board, as to whether D25 actually demonstrates general technical knowledge, is therefore not relevant to the decision on its admissibility and can remain open. "
- D25 is not admitted.
- The Main request is not novel over D1.
- AR-2 is held to be novel and inventive.
- There was an objection of insufficient disclosure regarding AR-2. The Board must decide whether the objection is admissible.
- "Although the ground for opposition under Article 100(b) EPC had not been raised in the respondents' notices of opposition, the parties agreed that objections under Article 100(b) EPC against the present auxiliary request 2 had already been raised several times by both respondents in the opposition proceedings and in the first appeal proceedings [T 1973/19]. The appellant had also expressly addressed these objections (respondent 2's reply to the appeal: section 4.1; respondent 1's brief of 24 March 2026: section I.2; appellant's brief of 29 June 2023, pages 4 and 5, and of 14 December 2023, section 2.b). However, since the Opposition Division had concluded that auxiliary request 2 (then auxiliary request 3) did not involve an inventive step, it did not address the issue of sufficient disclosure. Although the admissibility of this ground for opposition was addressed in the preliminary opinion of the Opposition Division of 29 January 2024 (page 10, first paragraph), no formal decision was made on this matter. Therefore, the present appeal proceedings had to first decide on the admissibility of this ground for opposition."
- "Objections under Article 100(b) EPC were already raised in the opposition proceedings. Therefore, this is not a ground for opposition raised for the first time in the appeal proceedings. The Board therefore agrees with Respondent 1 that the strict requirements laid down in G 10/91 for considering a ground for opposition raised for the first time in the appeal proceedings – in particular the requirement of the patent proprietor's consent – are not applicable in the present case "
- " the admission of a ground of opposition that was not already raised in the notice of opposition but was raised during the opposition proceedings is a discretionary decision (see case law, supra, IV.C.4.1 and IV.C.4.5). This decision rests either with the Opposition Division or with the Board itself, within the powers conferred upon it by Article 111(1) EPC (i.e., in the exercise of its functions within the jurisdiction of the Opposition Division). In the present case, the Board considered it appropriate to exercise its power under Article 111(1) EPC and to decide on the admission of the ground of opposition itself, pursuant to Article 100(b) EPC."
- "the Board concluded that the ground for opposition under Article 100(b) EPC is prima facie relevant and could potentially be decisive for the outcome of the case (G 10/91: Section 2 of the Headnotes"
- "the Board is of the opinion that the objection of [insufficient disclosure] was only raised at a later stage of the proceedings by the specific wording of granted claim 15 and by the amendment to the claim made in auxiliary request 2. In particular, the Board cannot see that the belated raising of the ground of opposition under Article 100(b) EPC could be considered an abuse of procedure."
- "the Board has therefore decided to exercise its discretion to admit the ground of opposition raised by the respondents under Article 100(b) EPC into the proceedings."
- The Board remits the case.
- The Notice of opposition was filed in 2017.