European Patent Office: Late-filed arguments before the Boards of Appeal

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

European Patent Office: Late-filed arguments before the Boards of Appeal

Practitioners before the EPO are aware that EPO proceedings are front-loaded. In effect, all evidence, amendments and arguments should be on file as early as possible in the proceedings. This especially applies to inter-partes proceedings, in which late-filed evidence or amendments could place other parties at a disadvantage.

The front-loading principle before the Boards of Appeal of the EPO is embodied in Article 114(2) EPC, which allows the EPO to disregard "facts or evidence" which are not submitted in due time. Articles 12 and 13 of the Rules of Procedure of the Boards of Appeal also set limits on the extent and timing of late submissions.

Generally, new facts, documents and evidence would be considered, if the filing was occasioned by an argument or a point raised by another party or in the appealed decision and could not have been filed before under the circumstances of the case. The timing of the filing is also a consideration.

Article 114(2) EPC does not mention late-filed "arguments", and many decisions of the Boards of Appeal interpreted this in a limiting manner (such as T92/92 and G4/92). Under this interpretation, late-filed arguments would always be admissible.

However, the EPO has also recognised that late-filed arguments – even if they are based on the same evidence – can substantially alter a party's case, and may place other parties at a disadvantage, in a similar manner to late-filed evidence.

We have noted a trend in a number of recent decisions from the Technical Boards of Appeal in cases in which the admissibility of late-filed arguments was at issue. In decisions T55/11 and T1621/09, a distinction is made between late-filed arguments which are a merely development of previous argumentation, or which present a completely new case. Arguments which are a development of previous argumentation are likely to be admitted, while arguments which present a completely new case may be rejected. In T1621/09, in particular, the Board applied similar considerations to late-filed arguments as had previously been applied to late-filed evidence: the timing of the arguments, the complexity of the arguments and the impact they might have on other parties to proceedings.

If late-filed arguments are to be admitted before the EPO, it appears therefore that the chances of success are greater if they are a development of previous arguments, rather than completely new arguments.

farrington.jpg

Edward Farrington


Inspicos P/SKogle Allé 2DK-2970 HoersholmCopenhagen, DenmarkTel: +45 7070 2422Fax: +45 7070 2423info@inspicos.comwww.inspicos.com

more from across site and SHARED ros bottom lb

More from across our site

Another IP litigator joins Winston & Strawn in Dallas as firm seeks to keep pace with ‘rapid’ growth of Texas market
Anthony O'Malley will replace Andrew Blattman at IPH, which owns several large IP firms across Australia, Asia and Canada
Barry Greenbaum, partner at Olshan Frome Wolosky, explains how in-house teams can update their approach to brand development, and where AI can add value
Christine Chiramel, who joins a full-service law firm after 17 years of working at specialist firms, says she’s excited to explore how corporate commercial issues are blurring into IP
Practitioners say increasing the pecuniary jurisdiction of India’s most popular IP litigation forum to around $2 million would spark unpredictability and make it difficult for SMEs to benefit
The Spain-based firm has appointed an industry veteran to lead the group, which it hopes will strengthen its ability to support clients in ‘disruptive technologies’
Shaina Haria, a final-seat trainee at an international law firm’s UK office, shares how she fell in love with IP and why the area of law has changed the way she views the world
Now in its sixth edition, the IP Case Law Conference was focussed on the notion of ‘growing through change’
Nick Redfearn and Khanh Nguyen of Rouse discuss Vietnam’s latest identification in the 2026 Special 301 Report and how the country is taking genuine steps to meet US expectations
Tatiana Campello reflects on 30 years of practising at the firm, and urges women IP attorneys to think beyond the day-to-day
Gift this article