Guy Brain

Associate, Patent Attorney

Guy is a European and UK patent attorney with a technical background in physical and theoretical chemistry. He enjoys working across the full scope of the chemical and pharmaceutical sciences, handling subject matter ranging from semiconductor devices to formulations for respiratory medicines, and has a particular interest in pharmaceutical inventions.  

Guy works with patent applications at every stage in their lifecycle. He has extensive experience of drafting applications for inventions in different fields and for clients with different goals. Assisting in the growth of a company’s patent portfolio, and the strategic considerations that involves, is a rewarding part of his work. This includes being involved in providing advice at every stage of the process, from identification of potential intellectual property to determination of an appropriate filing and prosecution strategy. He has also been involved in a number of oppositions, acting both for patentees and opponents.       

Through working with clients who file in a large number of countries around the world, Guy has insight into the handling of patent applications across a large portfolio. 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 is also with technology transfer organisations and he is aware of the considerations involved in that industry and is used to working closely with academics. 

In addition to prosecution work, Guy has been involved in due diligence matters and has also assisted with consolidating and recording transfers of ownership for patent estates. He has also worked on a number of freedom to operate and validity analyses. 

Guy is listed as a "Rising Star" in the Managing Intellectual Property (MIP) IP Stars Handbook.

Guy joined J A Kemp in 2011 and became an associate in 2016.

Services & Specialisms



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

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

Contact Guy

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

or call +44 20 3077 8600

Can We Help You?