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J A Kemp

Work 020 3077 8600
Fax 020 7430 1000
Cambridge, London, Munich, Oxford, Paris

John Leeming

Work 020 3077 8600
J A Kemp

Work Department

Engineering and IT


Partner, European Patent Attorney, UK Chartered Patent Attorney


John has over 25 years' professional experience. He prosecutes patent applications in the optical, electronic and software fields, with particular expertise in semiconductor device manufacturing equipment and processes. John's clients range from large multinationals to smaller start-ups, including firms that have successfully progressed beyond the early stages to develop extensive foreign filing programmes. Clients appreciate John's pragmatic and cost-conscious approach to prosecution as well as his ability to effectively capture the essence of an invention in drafting applications.

John also handles litigation and enforcement matters, having conducted IPEC and Patents County Court proceedings and assisted in various Patents Court proceedings over the years.Many matters have been successfully resolved without recourse to litigation, sometimes making use of alternative dispute resolution methods such as mediation and IPO Opinions. John's approach is to take clear and decisive action early in correspondence to prevent a matter escalating to litigation.

He also successfully handled, on behalf of the opponent, a reference to the European Patent Office Enlarged Board of Appeal (T0787/06 (Sony) relating to web publishing and T0495/07 (Ricoh) relating to image processing.

He is the primary contact at J A Kemp for UK and Community Registered Design matters.

John has extensive experience in recovering lapsed patents and applications, using restoration and restitutio procedures in the UK Intellectual Property Office (UK IPO), the EPO and elsewhere in Europe. The crucial factor in such proceedings is correct presentation of the evidence; viewed from the appropriate perspective an apparently hopeless case can become much more promising. He represented the proprietor in Ament's Patent [1994] RPC 647 which overturned the UK IPO's practice that lack of funds could never be a ground for restoration of an inadvertently lapsed patent.

John joined J A Kemp in 1988 and became a partner in 1994.


Fellow of the Chartered Institute of Patent Attorneys (CIPA), Member of the Institute of Professional Representatives before the European Patent Office (EPI), Director and Deputy Chairman of PAMIA Limited (the UK patent attorney profession's mutual insurer), Member of the Union of European Practitioners in Intellectual Property (UNION), Member of the Society for Computers and the Law


University of Oxford, Masters Degree in Physics

London: TMT (technology, media and telecoms)

PATMA: Patent attorneys

Within: PATMA: Patent attorneys

J A Kemp is 'extremely meticulous in fully understanding the business context, strategies and needs' of its clients, which include NBCUniversal, University of Vienna and Pharma UK. Celia Keen is head of the chemistry and pharmaceuticals team and has extensive experience in drafting and prosecuting patents. The 'excellent' Mark Roberts is 'very knowledgeable about European patent prosecution' and 'offers prompt and appropriate advice'. Other key team members are Patrick Campbell, Kieron Grehan, Andrew Webb, and Simon Wright, who are all 'excellent lawyers'. Key mandates included Chris Milton advising Semblant on the management of its patent portfolio and Amanda Simons assisting F2G with the drafting and prosecution of its new patent applications. Other recommended individuals include Ravi Srinivasan, John Leeming, Andrew Bentham, Sarah Roques, and Graham Lewis.

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