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Guy Brain

Partner, European and UK Patent Attorney

Guy is a European and UK Patent Attorney based in our London office. He enjoys working across the full scope of the chemical sciences, handling subject matter ranging from semiconductor devices to formulations for respiratory medicine. He has a particular interest in pharmaceutical inventions.

Guy has extensive experience of drafting applications for inventions in a variety of fields and for clients with different goals. Supporting the growth of a company’s patent portfolio and advising the client on strategic considerations is a rewarding part of his work. He provides support and advice at every stage of the process, from the initial identification of potential intellectual property to the determination of an appropriate filing and prosecution strategy. In the pharmaceutical field, Guy has successfully prosecuted a number of challenging patent applications claiming new polymorphic forms of known compounds.

Working with applicants who file in a large number of countries around the world, Guy has gained insight into handling portfolios with broad geographical scope. This includes familiarity with prosecution in countries where applications are less commonly filed, as well as experience in how to leverage the grant of patents in some countries to streamline the prosecution of a family. A significant part of Guy’s work relates to technology transfer and he is used to working closely with academics.

Guy also has been involved in due diligence matters, consolidation of ownership for patent estates and a number of freedom to operate and validity analyses.

Guy joined J A Kemp in 2011 and became a partner in 2022. He is listed as a 'Rising Star' in the Managing Intellectual Property IP Stars Handbook.




University of Oxford, Masters Degree in Chemistry including research in quantum mechanical simulations of condensed phases

Professional Qualifications

European Patent Attorney; UK Chartered Patent Attorney

Membership of Professional Bodies

Fellow of the Chartered Institute of Patent Attorneys (CIPA); Member of the Institute of Professional Representatives before the European Patent Office (EPI)



Tel: +44 20 3077 8600

80 Turnmill St,

Contact Guy

If you wish to talk to Guy Brain, please send an email directly to

or call +44 20 3077 8600

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