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

Tie up between Belgium-based firms will create an outfit with almost 30 UPC representatives, and a tier one-ranked patent disputes team
Blank Rome’s launch in West Palm Beach, marked by the arrival of two IP partners, comes in response to rising demands from technology clients
Abion says it has brought on board Matt Serlin as its first US hire to meet client demand for ‘full circle’ trademark and domain name services
News of Health Hoglund joining Sisvel and the Delhi High Court staying a $2.2 million decree in favour of Philips were also among the top talking points
The firm is continuing its aggressive IP hiring streak with the addition of partner Matthew Rizzolo
Pantech counsel Shogo Matsunaga speaks exclusively to Managing IP about how his team proved Google’s unwillingness, and ultimately secured a landmark SEP settlement
New partners, including the firm’s first female head of a department, are eyeing a deeper focus on client understanding
Chunguang Hu of China PAT explains why his ‘insider’ experience as a patent examiner benefits clients and why he wants to debunk the myth that IP has limited value in China
Essenese Obhan shares his expansion plans and vision of creating a ‘one-stop shop’ for clients after Indian firms Obhan & Associates and Mason & Associates joined forces
From AI and the UPC to troublesome trademarks in China, experts name the IP trends likely to dominate 2026
Gift this article