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Leythem A. Wall
+44 (0)20 7864 2814

16 Old Bailey
London EC4M 7EG
United Kingdom

+44 (0)20 7864 2800

Bar and Court Admissions

  • European Patent Office
  • European Union Intellectual Property Office
  • England and Wales (Higher Courts Patent Litigator)
  • UK Intellectual Property Enterprise Court
  • UK Intellectual Property Office


  • Nottingham Law School
    PGCert, Intellectual Property Litigation and Advocacy, distinction, 2016
  • University of Strasbourg
    DESU, Patent Litigation in Europe, high honors (mention bien), 2014
  • Queen Mary, University of London
    PGCert, Intellectual Property Law, merit, 2007
  • Queen's College, University of Oxford
    M.Chem., Chemistry, first class honors, 2005


  • Dutch
  • French

Leythem A. Wall

Partner, European Patent Attorney

Leythem Wall is a chartered UK patent attorney, a Higher Courts patent litigator, a European patent attorney, and a European trademark and design attorney. His practice involves patent drafting, prosecution, third-party observations, opinions on infringement and validity, freedom-to-operate assessment, portfolio management, and UK and pan-European pre-litigation strategy, including detailed advice on the Unified Patent Court (UPC). He has extensive experience in European oppositions and appeals, including representation in oral proceedings before the European Patent Office (EPO). Mr. Wall has also successfully coordinated oppositions and appeals in the United States, China, and India.

Mr. Wall's technical experience includes biotechnology, chemistry, agrochemicals, pharmaceuticals, petrochemicals, catalysts, polymers, nanotechnology, marine, aerospace, coatings, paints, semiconductors, superconductors, medical devices, telecommunications, and consumer products including mechanical devices. Since 2005, Mr. Wall has worked in both private practice and as industry IP counsel in the UK and abroad. As such, he is in a unique position to understand his clients' needs and provide a commercially-focused IP service that adds value to their businesses.

Mr. Wall is a frequent lecturer on patent law and has spoken at a number of events in Europe, the United States, and Asia.


  • Won numerous defensive and offensive oppositions and appeals at the EPO in a variety of technical areas, including biofuels, catalysts, chemical intermediates, coatings, oil and gas, petrochemicals, polymers, and specialty chemicals.
  • Currently handling over ten oppositions and appeals at the EPO for clients Invista, PQ Corporation, and SWM International.
  • Wrote the patent applications for a French medical device company, which has now raised over 20 million EUR in investment.
  • Former in-house IP law attorney for ExxonMobil working in a variety of technical fields ranging from biofuels to polymers to business methods; had global responsibility for the Oxo patent portfolio, 2010-2013.
  • Served as IP counsel for AkzoNobel, globally responsible for their marine, protective coatings, and aerospace patent portfolios, 2009-2010.
  • Worked under Professor Peter Edwards FRS of Oxford University, investigating the dielectric catastrophe in high temperature superconducting systems, 2004-2005.

Professional Recognition

  • Michel Scholarship, University of Oxford.
  • European Chemist (EurChem).
  • Chartered Chemist (CChem).
  • Chartered Scientist (CSci).

Professional Activities

  • Intellectual Property Owners Association (European Practice Committee, 2014-present)
  • European Patent Litigators Association (EPLIT) (2014-present)
  • European Patent Institute (EPI) (2009-present)
  • Chartered Institute of Patent Attorneys (CIPA) (Litigation Committee,
    2014-present; Fellow, 2010-present)
  • Royal Society of Chemistry (RSC) (Law Group, 2011-present)
  • European Qualifying Examination Committee (Opposition Paper, 2013-present)

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