Our people

Callum McGuinn

Callum McGuinn

Our People

Callum McGuinn

Partner, Patent Attorney



UPC Representative

Our People

Our IP specialists work at all stages of the IP life cycle and provide strategic advice about patent, trade mark and registered designs, as well as any IP-related disputes and legal and commercial requirements.

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Callum is experienced in the drafting and prosecution of patent applications in the chemistry and materials fields before the European Patent Office and worldwide. He represents clients in oppositions and appeals at the EPO and conducts extensive freedom to operate analyses. 

Areas of Expertise

  • Polymers and polymer manufacture, particularly polyethylene
  • Energy Storage particularly battery materials, predominantly lithium ion battery materials
  • Fuel cells
  • Catalysts
  • Inorganic materials, in particular glasses and alloys
  • Small-molecule pharmaceuticals including antibiotics, antibody-drug conjugates and cancer therapeutics


Callum works with a number of large multinational chemical companies including polymer manufacturers, consumer products companies and speciality chemicals companies, as well as smaller local clients.


Callum has a Master’s degree in chemistry from Oxford University, which included a year of research focusing on spectroscopic and computational studies of small gas-phase transition metal clusters. He joined Mewburn Ellis LLP in 2012, qualifying as a Chartered Patent Attorney and European Patent Attorney in 2016. He completed a three-month secondment to a US law firm, gaining insight into US patent practice, and previously spent two days each week on secondment to a multinational chemical company. Callum became a Partner in 2021.


Named as a "Rising Star" in the Managing Intellectual Property’s IP Stars 2018 - 2021 and is listed as a "recommended lawyer" and "key lawyer" in the 2022-2024 edition of The Legal 500.

"I have worked with Mewburn Ellis for almost 30 years, and with Callum for the last 5 years. Since then I have relied on Callum’s skills as a patent attorney to secure success during prosecution and opposition at the EPO. The quality and consistency of the work of Callum and the team at Mewburn Ellis has been essential to developing Nova’s strong IP portfolio in Europe and I have very much enjoyed working with them". Scott Chisholm - Nova Chemicals