Our People


Seán Walton

Partner, European Patent Attorney


Seán Walton
Seán Walton

Seán joined Mewburn Ellis LLP in 1990, qualifying as a Chartered Patent Attorney and a European Patent Attorney in 1994. He joined the partnership in 1996.

Seán has a degree in Molecular and Cellular Biology from University of Cambridge.

Seán handles patent work in the biotechnology field in particular immunology, antibody engineering, vaccines, diagnostics, medical devices, especially for drug delivery, and plant biotechnology. Seán has considerable experience of European opposition and appeal procedure and advises in strategic patent portfolio planning and analysis, including for applications and oppositions relating to several of the currently world-leading approved biopharmaceuticals. He has been involved in various UK and US litigation and interference proceedings. His clients include major international, US and European companies, including Big Pharma and biotechnology companies, also smaller growing and start-up companies in the USA, UK and Europe, and research institutions.

“Highly Recommended” for patent prosecution in ‘IAM Patent 1000: The World’s Leading Patent Practitioners’ 2012, which reports that in oppositions Seán “puts the other side through its paces” and 2014 which states “Seán Walton is an authority on drug delivery and plant biotechnology and a favourite of US rights holders”.  Also recognised in the 2016 guide “Based in Cambridge life sciences virtuos  Seán Walton has won a loyal following of multinational pharmaceutical companies, US universities, research institutes and a raft of foreign businesses.” Seán has once again been recognised in the 2017 guide. He is noted as a key player in our traditionally strong life sciences practice with one client commenting that he is “the guy you pick if you want quality”. In the 2018 “astute” Seán is praised for his work defending five European patents in a string of EPO proceedings. The 2019 edition of IAM Patent 1000 recognises Seán for being able to “sidestep all manner of obstacles with ease”.

Seán is individually recognised in Managing Intellectual Property’s IP Stars 2014 – 2019 as an ‘IP Star’.

Recognised as a UK ‘Life Science Star’ – LMG Life Sciences Europe 2014.

t: +44 (0)1223 420383
e: sean.walton@mewburn.com