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Your European patent just got refused, or an opponent stripped away the claims you fought years to secure. Before you walk away, know this: that decision is not final. EPO appeal proceedings give you a second, independent hearing before judges who did not make the original ruling. But the window is short, the rules are unforgiving, and one missed deadline ends the case for good. This guide walks you through how the appeal works, what it costs, and the mistakes that sink most appellants.
What Are EPO Appeal Proceedings?
EPO appeal proceedings are the formal route to challenge a decision of a first-instance department of the European Patent Office. They are governed by Articles 106 to 112 of the European Patent Convention (EPC). Under Article 106(1) EPC, you can appeal decisions of the Receiving Section, the Examining Divisions, the Opposition Divisions, and the Legal Division.
The appeal is decided by the Boards of Appeal, which sit separately from the examiners and opposition divisions that issued the original ruling. That independence is the whole point: a fresh panel reviews the case on both the law and the facts.
One threshold rule controls who may file. Only a party that is “adversely affected” by the decision can appeal, meaning the order did not grant what that party requested. An applicant whose application was refused qualifies. In opposition, both the patentee and the losing opponent can appeal the parts of the decision that went against them. If you are still inside the nine-month window and have not yet challenged a granted patent, see our guide to EPO opposition proceedings first, because appeal is the stage that follows opposition.
The Two Deadlines That Decide Your Appeal
Almost every failed appeal dies on a date, not on the merits. There are two deadlines, both running from the date the contested decision is notified:
- Notice of appeal — 2 months. File the written notice and pay the appeal fee within two months of notification. Without timely payment, the appeal is deemed not to have been filed.
- Statement of grounds — 4 months. Within four months of notification, file the full written reasoning explaining why the decision was wrong. This must set out your complete case.
Treat these as hard stops. The Boards apply them strictly, and there is no informal grace period. If you intend to appeal, calendar both dates the moment the decision arrives, and start drafting the grounds early, because four months disappears faster than you expect once you are reconstructing the entire argument.
Interlocutory Revision: A Quick Win Before the Board
In ex parte cases (an applicant appealing a refusal), there is a built-in shortcut called interlocutory revision. If the department that issued the decision considers the appeal admissible and well-founded, it must rectify its own decision.
In practice, this means a strong, narrowly targeted appeal can succeed without ever reaching a Board. The first-instance department has three months to grant rectification; if it does not, the case is passed to the Boards of Appeal. This is why a precise, focused statement of grounds, one that fixes the exact objection the examiner raised, often pays off faster than a sprawling attack on everything.
Inside the Boards of Appeal
The Boards of Appeal are organized into Technical Boards of Appeal, which handle the bulk of patent disputes by subject-matter area, and a Legal Board of Appeal for procedural and legal questions. Each technical board typically decides cases with a panel of three or, for harder matters, five members.
Oral proceedings are a normal part of the process. They can be held in person in Munich or by video conference, and the panel often signals its preliminary view in advance so both sides know where the case stands before the hearing. For many appellants, the oral hearing is where the appeal is actually won or lost, so preparation matters as much as the written grounds.
The Convergent Approach Under RPBA 2020
The Rules of Procedure of the Boards of Appeal (RPBA 2020) entered into force on 1 January 2020 and reshaped how appeals are run. The headline change is the “convergent approach”: you must put your complete case forward at the start, in the grounds of appeal or, for a respondent, in the reply.
Anything new after that, fresh evidence, new arguments, or new claim requests, counts as an amendment to your case and is admitted only at the Board’s discretion, and only if you can justify why it comes so late. The Boards apply these limits firmly.
The practical lesson is blunt: the appeal is not a chance to start over. Hold back your best argument or your fallback claim set and you may never get to use it. Front-load everything, including auxiliary requests, the first time you file.
The Enlarged Board of Appeal and Points of Law
Above the technical and legal boards sits the Enlarged Board of Appeal (EBoA). It does not re-hear ordinary appeals. Instead, it ensures the law is applied uniformly and resolves the hardest legal questions.
- It answers points of law referred by a Board when case law is inconsistent (issued as “G” decisions that bind future cases).
- It gives opinions on important legal questions referred by the EPO President.
- It hears petitions for review, a narrow remedy for serious procedural defects, available since EPC 2000.
For most applicants, the EBoA matters indirectly: its G decisions set the rules your appeal will be judged by. Knowing the relevant ones, and citing them accurately, signals to the Board that your case is grounded in settled law.
Costs, Timeline, and Appeal Strategy
Plan for the long game. A typical appeal takes roughly two to four years from filing to decision, so it rarely makes sense for a patent with little commercial life left.
The appeal fee is reimbursable in full if you withdraw the appeal before filing the grounds, and partially (25%, 50%, or 75%) if you withdraw at later stages. The exact current figures are published in the EPO’s official schedule of fees. That structure rewards a clear go/no-go decision early, before you sink cost into a case you may not pursue.
A simple decision rule helps: appeal when the refused or amended claims still cover commercially important subject matter, the first-instance reasoning contains a concrete legal or procedural error you can point to, and the patent’s remaining term justifies a multi-year fight. If two of those three are missing, filing an EPO divisional application or refiling is often the smarter move. It also helps to understand how Europe’s standards differ from the US, which we cover in USPTO vs EPO patent requirements, and how the new Unitary Patent and UPC change enforcement once your patent survives.
How PerspireIP Can Help With Your EPO Appeal
A European appeal turns on the quality of your written grounds and the strength of your fallback claim sets, filed correctly the first time. PerspireIP supports patent owners and counsel with prior-art and validity analysis, claim-chart preparation, and patent drawings that meet EPO standards, so your appeal rests on a complete, evidence-backed case. Talk to our team about your pending refusal or opposition decision.
Frequently Asked Questions
How long do I have to file an EPO appeal?
You must file the notice of appeal and pay the appeal fee within two months of the decision being notified, and file the full statement of grounds within four months. Both deadlines are strict.
Who can file EPO appeal proceedings?
Only a party adversely affected by the decision, meaning the outcome did not match its request. In opposition, both the patentee and the losing opponent can appeal the parts that went against them.
Can an examiner overturn their own refusal?
Yes. In ex parte appeals, interlocutory revision lets the first-instance department rectify its decision within three months if the appeal is admissible and well-founded, avoiding the Board entirely.
What is the RPBA 2020 convergent approach?
It requires you to present your complete case in the grounds of appeal or reply. New facts, arguments, or claim requests filed later are admitted only at the Board’s discretion and only with strong justification.
How long do EPO appeal proceedings take?
Typically two to four years from filing the appeal to a final decision, which is why appeals make most sense for patents with significant remaining commercial value.
What does the Enlarged Board of Appeal do?
It resolves points of law where case law conflicts (issuing binding G decisions), gives opinions on legal questions, and hears petitions for review of serious procedural defects. It does not re-hear ordinary appeals.