ARTICLE
19 February 2026

Can I Appeal An EPO Opposition Decision?

PC
Potter Clarkson

Contributor

Potter Clarkson is one of Europe’s leading full-service IP law firms. Our IP attorneys and solicitors maximise the value of our clients' innovation by providing the experience, vision and clarity required to create, protect, leverage and defend their ideas in the most commercial and strategic ways all over the world.
A decision of the EPO Opposition Division can be appealed by any party adversely affected, such as the patent proprietor, an opponent, or a valid intervenor.
United Kingdom Intellectual Property
Potter Clarkson are most popular:
  • within Government and Public Sector topic(s)

ARTICLE SUMMARY

A decision of the EPO Opposition Division can be appealed by any party adversely affected, such as the patent proprietor, an opponent, or a valid intervenor. The appellant must file a notice of appeal and pay the fee within two months, submit the grounds within four months, after which the Board of Appeal conducts an independent review that may uphold, overturn, or remit the case.

A decision of the EPO Opposition Division (OD) can be appealed, but only by a party who took part in the opposition proceedings and is adversely affected by the decision.

Under Article 107 EPC, an appeal is restricted to “any party to proceedings adversely affected by a decision,” which means the patent proprietor, an opponent, or a valid intervenor (e.g., an assumed infringer who intervened under Article 105 EPC).

To validly appeal, the adversely affected party must file a notice of appeal and pay the appeal fee within two months of notification of the written decision and must submit the statement of grounds of appeal within four months. The Board of Appeal will then conduct an independent judicial review of the OD's decision, which may result in the decision being upheld, set aside, or the case being remitted back to the OD for further examination.

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

[View Source]

Mondaq uses cookies on this website. By using our website you agree to our use of cookies as set out in our Privacy Policy.

Learn More