Phil Jeffrey



Phil is a Chartered UK Patent Attorney and European Patent Attorney with a First Class Honours degree in Physics and a PhD in laser physics and photorefractive materials. He joined Dehns in 1994 and became a Partner in 2002.



Phil is an experienced patent attorney with technical expertise across a wide range of high-technology physics and engineering fields including photonics, optoelectronics, mass spectrometry, oil drilling and exploration, medical devices, artificial intelligence (A.I.), nanotechnology, holography, lasers, optical devices, smartphones, optical communication systems, immunoassays, imaging apparatus and endoscopes.

Phil acts for several major US and Asian corporations including Waters Corporation, Micromass, Baker Hughes Incorporated, Xiaomi and FUIJFILM. He regularly provides detailed patentability, infringement, validity, due diligence and other strategic advice and analysis to both large corporations as well as SMEs. Phil is a patent drafting, patent prosecution and registered designs expert and has a very high UK, EPO and US patent allowance rate.

Phil enjoys helping companies manage IP assets to help create and extract value and to adopt a more open model of innovation including licensing-in technologies from others and licensing-out technologies to others.

Phil is recognised as being particularly experienced in IP strategy (see ‘Other’ section below), IP management and enjoys helping start-ups and SMEs develop and execute an IP strategy which seeks to increase VC investability. Phil also helps start-ups and SMEs with VC funding rounds and advises companies during secondary buyouts.

In addition to extensive UK and EPO drafting and patent prosecution experience, he has experience in UK revocation and post-grant proceedings and in EPO Opposition and Appeal hearings. He is experienced at effectively prosecuting US patent applications including US Examiner interviews.

Phil is a member of Dehns’ Management Board and is Dehns’ Business Development Partner. Phil regularly visits the US, Japan and China and is a sub-4 hour marathon runner.


Qualifications and Memberships

  • UK Registered Patent Attorney, 1999
  • Professional Representative before EUIPO, 1999
  • European Patent Attorney, 1998
  • Certificate in IP Law, University of London, 1995
  • Fellow of the Chartered Institute of Patent Attorneys
  • European Patent Institute


Higher Education

PhD, Southampton University, “Holographic Information Processing”, 1994

BSc Hons (First Class), Southampton University, Physics, 1991


“UK Patent Box Proposals”, Intellectual Property Magazine, June 2010. Click here to read article.


“Evolution of IP practices and the emergence of new business models for IP firms” MIP Global IP & Innovation Summit, Shanghai, 3 September 2014

“UK and European IP Developments”, Houston Intellectual Property Law Association Annual Conference, Houston, September 2013

“Recent Developments in European Practice”, Houston Intellectual Property Law Association Annual Conference, Houston, October 2012



Phil was recognised in the 2018, 2019, 2020 and 2021 editions of IAM Strategy 300 – The World’s Leading IP Strategists, which identifies those “shown to possess world-class skills in the development and roll-out of strategies that maximise the value of patents, copyright, trademarks and other IP rights”. He was also recommended in the 2020 edition of The Legal 500 directory.

Contact details

The Brinell Building
30 Station Street
United Kingdom

+44 (0)1273 244 200