In the course of 25 years in the patent profession, Duncan has established a well-regarded international practice, spanning the UK, USA, Japan, Israel, and Northern Europe.

Duncan specialises in the drafting and prosecution of patents in the fields of materials, including semiconductors, and computer-implemented inventions, particularly in the consumer electronics sector. He also handles patent cases in a wide range of other industries, such as oil and gas, semiconductor manufacturing, and medical devices.

Duncan also provides filing strategy and portfolio management advice, regularly represents clients in oral proceedings at the EPO and UK IPO, evaluates standard-essential patents, conducts freedom to operate searches, and handles design registrations in the UK and overseas.