Partner, Patent Attorney Southampton
Profile of Garreth Duncan

Over the past 20 years, I’ve been lucky enough to work with some great legal and scientific minds. Every day still brings that element of surprise as I never know what new and inspiring invention will hit my desk next.

Before I arrived at the firm, I worked in private practice as well as an in-house attorney at Pfizer – my experience taking in both their European and US Patent Departments. At Pfizer I was responsible for IP, both for new drugs in discovery, including drafting patent applications and prosecuting them worldwide, and for products in late-stage development, including providing validity and freedom-to-operate opinions and developing new IP opportunities for the products.

My 20 years’ experience in the patent profession embraces all chemical areas including pharmaceuticals, food chemistry, petrochemicals, agricultural and polymer chemistry, as well as chemical synthesis and processes. In the pharmaceuticals sector, I handle patent applications for new active substances, formulations, combination therapies, new medical indications, and manufacturing processes.

I have particular experience in obtaining supplementary protection certificates (SPCs) and other forms of patent term extension, advising clients on SPC strategies and filing and prosecuting SPC portfolios throughout Europe on a number of important marketed pharmaceutical and plant protection products. I also have experience advising on regulatory-based protection for pharmaceuticals.

I act for a broad spectrum of clients, from multinationals and up-and-coming life sciences companies through to universities, spin-out and start-up companies.


Ranked as an IPSTAR 2021.


  • MChem in Chemistry, St Anne’s College, University of Oxford.
  • Research project on free-radical routes to novel alkaloids.
  • Certificate in Intellectual Property Law, Queen Mary, University of London
  • European Patent Attorney 2002.
  • Chartered Patent Attorney 2005.
  • Chartered Chemist.


  • Chartered Institute of Patent Attorneys (CIPA).
  • European Patent Institute (epi).
  • Royal Society of Chemistry (RSC).
Managing IP IPSTAR 2020
IP Stars (Managing IP)
Really adds value to cases and is a pleasure to work with.
IAM Patent 1000
Garreth Duncan matches incisive SPC knowledge with "attention to detail, advocacy for clients' positions, thoughtfulness and a willingness to embrace creative solutions".
IAM Patent 1000
Duncan has broad horizons, having previously worked in Pfizer’s European and US patent departments, and a knack for obtaining SPCs.
IAM Patent 1000
Garreth Duncan provides “dynamic and pragmatic advice”, especially concerning SPCs and other patent term extensions; his in-house stint at Pfizer demonstrates his outstanding industry connections.
IAM Patent 1000
IP Star 2019/20: recognising top practitioners in private practice who have performed exceptionally for their clients and firms in the past year.
IP Stars (Managing IP)
Garreth Duncan has an assured command of the food chemistry, petrochemicals and polymer chemistry fields; obtaining SPCs is a speciality.
IAM Patent 1000
A trusted partner who can be relied upon for his technical expertise.
IAM Patent 1000
Exceptionally knowledgeable.
IAM Patent 1000
Garreth Duncan specialises in life sciences and is notably strong in obtaining supplementary protection certificates.
Legal 500
Recommended by Legal 500 2020
Legal 500
Patrons marvel at the quality and cost effectiveness of the services provided by the eminently qualified Duncan.
IAM Patent 1000
Garreth Duncan's stint at Pfizer has endowed him with first-hand insight into the pharmaceutical sector – and in particular the commercial importance of SPCs and how best to obtain them.
IAM Patent 1000
Those seeking counsel on SPCs need look no further than Kirk Gallagher and Garreth Duncan.
IAM Patent 1000