Partner at Carpmaels & Ransford LLP
As a partner within the engineering and tech practice group, Chris Tunstall handles a diverse portfolio of technologies in the physical sciences, working with medical device businesses, original equipment manufacturers in the automotive sector, semiconductor companies and IT and telecoms service providers. Mr Tunstall’s experience in both strategic patent prosecution and opposition and appeal proceedings at the EPO has led to longstanding relations with international clients, most notably Johnson & Johnson – for whom he handles and defends a huge portfolio covering surgical devices and implants and ophthalmic devices and equipment – and Micron Technology, Inc, one of the world’s leading providers of advanced semiconductor solutions.
Mr Tunstall adopts an upbeat, ambitious and practical approach to his work, and is often asked to advise on business-critical patent strategies, informed by his careful understanding of the objectives in view and his 30 years of experience in the industry. Notably, Mr Tunstall defended Micron Technology’s synchronous DRAM business in Micron’s epic 13-year battle with Rambus, in which he successfully neutralised a series of European patents held by Rambus. These cases yielded valuable insights into a series of complex legal questions concerning the extent to which European patent applicants can redefine the inventions for which they are seeking protection; subsequently, they have been used as a teaching resource by the EPO itself.
Mr Tunstall is a qualified litigator and has been heavily involved in patent litigation in all of the English courts, including the Supreme Court, as well as in France, Germany and Italy. He is often called on to engage with technologies outside his core practice where his insights have added significantly to the conduct of litigations and important opposition cases. Recent engagements have included forays into combination therapies and DNA sequencing.
During his professional career, Mr Tunstall has spent time serving on the executive committee of a major international law firm. He graduated with a first-class degree in physics from St Peter’s College, University of Oxford.