EPO appeal board says an online filing outage cannot erase patent rights

The story

The European Patent Office’s Legal Board of Appeal has restored an anonymized divisional patent application that was filed one day too late because the Office’s electronic filing systems failed. In J 2/25, the Board held that an applicant could rely on an EPO notice promising protection when an accepted online filing service was unavailable. The ruling is important because missing this particular filing window can permanently close a route to patent protection; ordinary deadline remedies generally do not reopen it.

A divisional application lets an inventor or company pursue subject matter disclosed in an earlier parent application, often to obtain a different set of claims. Under the European Patent Convention, however, the parent must still be pending on the day the divisional is filed. Here, the parent patent was granted on November 29, 2023. That made November 28 the last practical day to file, not a conventional time limit that could simply be extended or restored.

According to the decision, several representatives tried to submit the divisional on November 28 through EPO Online Filing, Online Filing 2.0 and the contingency upload service, or CUS. Certificate and login errors blocked the attempts. The representatives documented what happened and reached the Office’s Customer Services department. Filing succeeded on November 29, after the parent was no longer pending.

The Receiving Section accepted that two filing tools had experienced technical trouble but said it had no record of a CUS outage. It therefore refused to treat the application as a valid divisional. That reasoning left the applicant in a procedural gap: the filing was late, yet mechanisms such as re-establishment of rights, further processing and an extension under Rule 134 were not available because parent pendency is a legal condition, not an ordinary deadline.

On appeal, the Board focused on the principle of legitimate expectations. An EPO notice published in its Official Journal said that if an online filing service became unavailable, applicants would not suffer adverse consequences when they met stated conditions. The Board found that this assurance was clear enough to be relied upon. It also rejected the idea that the applicant had to prove every possible channel had failed. Under the notice, the unavailability of one accepted electronic filing route attributable to the Office could be sufficient.

The evidence mattered. The Board accepted that the representatives made repeated, good-faith attempts and that the problems were not simply invented after the deadline. It also criticized the first-instance decision for giving too little explanation of what the EPO had investigated. An absence of an outage entry was not, by itself, a transparent answer to detailed evidence from multiple users. The Board treated the filing requirement as satisfied, ordered the November 29 application to be processed as a divisional and reimbursed the appeal fee because of a substantial procedural violation.

The result is not a general grace period. Applicants still need to show prompt and credible filing attempts, preserve evidence and connect the failure to EPO infrastructure. A dead laptop, a local network failure or an expired credential may not qualify. Practitioners commenting on the case recommend retaining screenshots and timestamps, trying the contingency service and contacting Customer Services immediately. Those steps do not guarantee relief, but they create the record a tribunal needs to separate an Office outage from user-side error.

The decision’s reach could extend beyond divisional applications because its logic concerns the EPO’s published safeguards for electronic filing. Yet caution is warranted. J 2/25 is marked for no distribution, and it does not automatically bind every later Board. Its force will depend on whether other panels adopt the same reading and whether the facts of future outages match the notice. The EPO may also refine its wording, logging or fallback channels as more of the patent process moves online.

INNOVOX analysis: the most consequential innovation here is institutional rather than technical. A patent office that makes digital filing the normal route also becomes a critical part of the reliability chain for preserving inventions. If that infrastructure fails at the decisive moment, the Office cannot treat opaque internal logs as conclusive while ignoring well-documented external evidence. J 2/25 aligns procedural fairness with the operational reality of online-only systems without removing applicants’ duty to prepare and act diligently.

What to watch now is whether the EPO publishes more granular incident records and whether later decisions clarify the threshold for attributing a failure to the Office. The practical standard will emerge from details: which error messages count, how quickly an applicant must notify the EPO, and whether using one working fallback remains expected. For inventors and patent owners, the immediate lesson is plain: a filing confirmation is the finish line, and every failed attempt before it should leave an auditable trail.

INNOVOX analysis

Digital patent administration turns system availability into a substantive rights risk. J 2/25 does not rewrite a statutory deadline; it holds the EPO to the safeguard it published for failures in its own electronic infrastructure. The decision therefore raises the value of auditable outage records for the Office and contemporaneous evidence for applicants.

What to watch

Watch whether the EPO updates its filing notices or incident-reporting practices, whether other Boards follow a decision marked for no distribution, and how future cases distinguish Office-side failures from local connectivity, certificate or user errors.