Oppositions at the EPO and other post-grant challenges, such as those at the USPTO, can be procedurally, technically and strategically complex. Our experience of these proceedings, representing both patentees and opponents, often involving multiple parties, makes EIP the firm of choice for clients seeking representation in these proceedings in all technical areas.

Expert team

Our team members have represented clients in hundreds of oppositions before the EPO over the last two decades.

By working collaboratively and sharing expertise we keep on top of the latest substantive and procedural developments before the EPO Opposition Divisions, Boards of Appeal and the Enlarged Board of Appeal.

Comprehensive service

We represent clients in person at hearings at the EPO in Munich, The Hague and Berlin, as well as using EIP's IT systems to ensure the best possible outcomes in virtual hearings.

Our integrated team of patent attorneys, litigators and paralegals can act in national court litigation alongside EPO opposition proceedings for a seamless, consistent and effective service.

We are also experienced at using Third-Party Observations at the EPO and WIPO to challenge patent applications before they are granted, which for some clients may be a more cost-effective manner in which to address third-party rights of potential concern.

Maximising success

We work with our clients to devise customised strategies in order to maximise success in commercially important oppositions. This can involve steps such as strategic collaboration with other parties sharing a common interest and holding mock hearings to hone strategies and arguments before the official hearing at the EPO. Mock hearings can range from two attorneys arguing both sides of the case up to having independent consultants acting as the Opposition Division or Board of Appeal, with teams of attorneys, experts and clients attending.

Very commercially focused, with wide strategic and tactical experience, and a huge depth of highly skilled technical knowledge.

— Legal 500 2021

Key Contacts

Partner Contact

Gareth Probert


UK and European Patent Attorney

Partner Contact

Monika Rai


UK and European Patent Attorney, Solicitor

Contact Us

+44 (0)20 7440 9510

or Enquire now

Bath +44
(0)1225 337843

EIP, Westpoint
James Street West
Bath, BA1 2DA, UK

Cardiff +44
(0)29 2023 0509

EIP, 40 Windsor Place
Cardiff, CF10 3BW, UK

Leeds +44
(0)113 245 7981

EIP, Broad Gate, 22-26 The Headrow, Leeds, LS1 8EQ, UK

London +44
(0)20 7440 9510

Fairfax House, 15 Fulwood Place
London, WC1V 6HU, UK

Denver, CO +1

EIP, 4600 S. Syracuse St.,
9th Floor
Denver, CO 80237 USA

*Please note that EIP is unaffiliated with the IRS and EIP Card

Düsseldorf +49
(0)211 9595 8500

EIP, Broadway Office
Breite Strasse 29-31
40213 Düsseldorf, Germany

Stockholm +46
8 502 461 11

Mäster Samuelsgatan 60
111 21 Stockholm