Gerard Chandrahasen

Gerard Chandrahasen

Gerard Chandrahasen


Gerard is a specialist in software patents in the UK, Europe, US, and the rest of the world. He advises tech companies both on protecting their IP and avoiding infringement.


Gerard currently advises over 100 tech start ups, working closely with CEOs, CTOs, and General Counsels to maximise the value of their companies through strategic use of intellectual property.


Gerard’s experience over 16 years in the profession includes leading the opposition to the Amazon one-click patent, patenting CGI for Lord of the Rings, protecting technology for Hewlett-Packard, Nokia, Unisys and Cambridge Silicon Radio, and patenting computer game software in the UK for Mind Candy.


He has been identified as one of thirty leading patent attorneys in the country by the Chambers Guide to the Legal Profession, and is a contributor to the Innovation Handbook.


He is one of the few UK patent attorneys with a qualification in computer science (BSc).

  • Chartered Patent Attorney

  • European Patent Attorney

  • Registered Patent Attorney in Australia and New Zealand


  • European Trade Mark Attorney

  • Solicitor of England and Wales

Carol Nyahasha

Associate (Trade Marks)

Carol specialises in advising tech companies on trade mark matters, and has extensive experience in the protection of trade marks in the UK, Europe and Internationally.  She is also experienced in negotiating and litigating disputes in both a direct and supporting capacity.

Carol has previously worked at a major UK law firms.


  • Registered Trade Mark Attorney

  • European Trade Mark Attorney


Sharn de Klerk

Senior Patent Administrator

Sharn has over twelve years experience in patent administration.


At Rational IP, she ably tracks hundreds of cases and thousands of deadlines, helping our clients to manage their intellectual property and providing key support to our team.


  • Certificate in Patent Administration (Chartered Institute of Patent Attorneys)