Dr Marianne Privett


Dr Marianne Privett is a Partner and UK Chartered and European Patent Attorney in the Chemistry, Biotechnology and Pharmaceuticals patent department. Marianne has experience in a variety of fields including catalysis, materials, pharmaceuticals, medical devices, laboratory equipment and packaging.

At AA Thornton we strive to be an inclusive organisation in which every employee can bring their whole self to work. You can read more about our diversity & inclusion initiatives here and can read the personal commitments made by AA Thornton Partners here.

Marianne is a lead partner of our internal Diversity & Inclusion committee and co-lead of the external industry initiative IP Ability. Marianne’s efforts in diversity have been recognised in WIPR’s inaugural ‘Diversity Champions’ list this year.

“Marianne provides invaluable legal advice relating to European patent practice, and her general communication skills are excellent.”

Legal 500 2023

"Marianne is 'very knowledgeable both in Chemistry and in IP law'."

Legal 500

"AA Thornton's level of service is 'outstanding' - 'timeliness and appropriateness of advice are a constant' according to clients, who rate the level of scientific knowledge displayed by the partners and associate lawyers as 'excellent'."

Legal 500

"AA Thornton is my favourite and most reliable Firm in the UK. It is one of the finest IP Firms in UK."

D Calab Gabriel, Managing Partner, Lex IP Care

“Thank you very much for ….. the constructive and straightforward approach of yours in the oral proceedings this week”

Member of EPO Board of Appeal.


Practice Areas
  • Patents
  • Patent Opposition
  • IP Due Diligence & Freedom to Operate
  • IP Strategy & Audits
Industries of Focus
  • Automotive & Aerospace
  • Materials
  • Medical Devices
  • Pharmaceuticals
  • Oil, Gas & Petrochemicals
  • Cosmetics & Personal Care
  • Cleantech (Clean Technology)
Core Responsibilities
  • Drafting patent applications
  • Prosecuting patent applications in numerous countries
  • Providing advice on patentability
  • Providing advice on freedom to operate
  • Managing patent portfolios
  • Oppositions and Appeals at the EPO
Professional Memberships
  • Fellow of the Chartered Institute of Patent Attorneys (CIPA)
  • Member of the European Patent Institute (EPI)
  • She began her patent career in 2003 at Johnson Matthey, a large speciality chemicals company
  • She began her career in private practice in 2007
  • She joined A.A. Thornton & Co. in 2010
  • She joined the EQE Examination Committee for Paper C in 2014
  • She was promoted to Senior Associate in July 2017
  • Marianne was promoted to Partner in September 2018
  • MChem and PhD Materials Chemistry, University of Southampton
  • Gained the Queen Mary Certificate in 2004
  • Qualified as a UK chartered patent attorney in 2010
  • Qualified as a European patent attorney in 2010
  • UK Intellectual Property Litigation Certificate
  • Representative before Unified Patent Court
  • French