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Stephen Duffield

Carpmaels & Ransford

2026_IP Stars IP Star.png
Position: Partner
Rating:
  • Patent star
Practice Areas:
Life sciences IP
Patent disputes
Intellectual property disputes
Jurisdictions:
Industry Sectors:
Biotechnology
Life sciences
Healthcare
Biography

Stephen is a Partner in the Life Sciences team and manages the firm’s Munich office. He is qualified as a patent attorney and as a solicitor, and is a registered UPC representative. Stephen brings each of these perspectives to the matters on which he works, where he has a particular focus on biological therapies. This work is often contentious and relating to therapies involving complex immunological aspects in their mechanisms of action. Stephen is regularly entrusted by clients with matters relating to blockbuster products. These clients recognise his key skills in distilling the complexities of their matters into easily understood arguments for use at the EPO, and in courts and patent offices across Europe. 

Stephen is regularly involved in UK and pan-European litigations, attacking and defending patents in EPO opposition proceedings and on appeal, and pressure testing patents before their assertion in litigation, including in the anti-TNF, anti-IL12, anti-IL23, anti-PCSK9, anti-IL4R and anti-CD38 fields as well as the immuno-oncology arena (immune checkpoint inhibitors and T-cell retargeting bispecifics). He also has an extensive prosecution andadvisory practice relating to patent applications in Europe and across the globe, SPCs and regulatory exclusivities, encompassing biosimilars.

Stephen is often sought out by clients for due diligence and freedom to operate matters, for his ability to assemble and focus teams to achieve results in commercially critical timeframes. He has a real understanding of the business drivers of his work, which was developed through a six-month secondment working in-house at the US patent law department of a global pharmaceuticals company.