Jin Ooi has an impressive ability to be across every detail of multifaceted litigation, whilst being hugely responsive. Not only is he a very strong UK patent litigator, but he is also maestro in coordinating the litigation streams across Europe.” - Chambers UK, 2024

Jin Ooi is an intellectual property litigator in the London office of Kirkland & Ellis International LLP. He is experienced in patent litigation and counselling (including on complex damages inquiries) mainly in the pharmaceutical and life sciences field (second medical use, biosimilars, small molecules, DNA sequencing, vaccines, transgenic animal platforms for antibody discovery), and in the FMCG and consumer products sector (shaving razors, potentially reduced-risk products including tobacco heating and vapour products, dishwashing tablets, coffee pods and capsules).

He is also experienced in litigating and arbitrating trade secrets disputes in the medical devices (bone cements), tech (LNG carriers) and aviation sector (airplane components, airport businesses), in addition to handling antitrust claims (cathode ray tubes, lithium ion batteries, forklift gas).

His clients have included Pfizer, Viatris, Astellas, Novartis, Regeneron, British American Tobacco, Samsung, Biomet and Procter & Gamble. Jin’s cases are often multi-jurisdictional requiring significant cross-border coordination across multiple forums.

Jin is recognised as a Next Generation Partner in both “Intellectual Property: Patents” and “Life Sciences and Healthcare” in the 2021–2024 editions of The Legal 500 UK. With a “keen intellect and considerable knowledge” and noted as a “powerhouse” and “a deep and strategic thinker”, Jin “is renowned for his ability to master knotty issues and has famed round-the-clock responsiveness”, in addition to having “an extremely sharp eye for detail and a wonderful ability to connect points in a case.” A “sharp strategist”, he “has a nose for a good point” and “he is full of good ideas.”

  • The Legal 500 UK (2024) noted: “Jin Ooi is extremely impressive and has a laser sharp focus when it comes to patent litigation. One of the most brilliant lawyers we have ever worked with.”
  • Chambers UK (2024) noted: “Jin Ooi has an impressive ability to be across every detail of multifaceted litigation, whilst being hugely responsive. Not only is he a very strong UK patent litigator, but he is also maestro in coordinating the litigation streams across Europe. … He has a phenomenal memory and is able to deploy his level of knowledge with absolute precision.”
  • JUVE Patent (2022) named him as “one to watch” in UK patent litigation: an “all-rounder”, Jin “stands out for the technical diversity of his cases, from pharmaceuticals to mobile communications to e-cigarettes - as well as his hard work and tenacity.”
  • IAM Patent 1000 (2023) noted: “Jin is a rising star in global patent litigation. His work inspires confidence – his approach is consistent and delivers information and advice swiftly. He is responsive, organised, understands new technologies quickly and has a deep understanding of both legal and technical aspects. Jin is an exceptionally smart patent expert. He stands out particularly for his great judgement and insight. He delivers solid strategy and is exceptional in coordinating legal matters across multiple jurisdictions.”

Prior to joining Kirkland, Jin worked at Allen & Overy LLP in London and before that Corrs Chambers Westgarth in Sydney. In recognition of his work in Australia, Jin was among a select few young lawyers awarded the 2014 Lawyers Weekly 30 Under 30 Awards, and a finalist in two categories in the 2015 Awards. His dual qualifications in law (1st class degree) and pharmacology give him a special insight into, and understanding of, his clients’ legal needs and commercial and regulatory imperatives.


Thought Leadership


“Patent Litigation 2019: Trends and Developments”, Chambers and Partners Practice Guides, 2019

“UK Patent Law: Hot Topics of 2018 and What’s Ahead”, Law360, 2019

“Actavis v Eli Lilly: outcomes”, IPPro, 2018

"Book review: Intellectual Property in Australia", The IPKat, 2017

"Applying Cartier v. BSkyB to UK life sciences patents", Law360, 2016

"Caught in the middle: ISPs face blocking orders after Cartier case", Intellectual Property Magazine, 2016

"The utility of the Cartier case in the life sciences context", Intellectual Property Magazine, 2016

"The International Arbitration Review (Chapter: Australia)" (3rd, 4th and 5th eds), Law Business Research, 2012-2014


Speaker, “Hot topics in patent litigation - a practitioner’s view”, Intellectual Property Law Discussion Group, University of Oxford, 2019

Speaker, “Insufficiency and the many shades of plausibility”, Young EPLAW Congress, Brussels, 2018

Speaker, "Where are we now with plausibility?", Young EPLAW Congress, Brussels, 2017

Speaker, "What companies need to know about the Bolar exemption", C5 EU Pharmaceutical Regulatory Law conference, London, 2016

Speaker, "Implications of Brexit for IP and IT legal practice", LexisNexis webinar, London, 2016

Speaker, “Second medical use - the UK perspective”, Future of Innovation in Medicine: Incentives for New Medical Treatments and Global Health conference, Seattle, 2015

Moderator, “Drug development and approval process with its part in exclusivity”, Future of Innovation in Medicine: Incentives for New Medical Treatments and Global Health conference, Seattle, 2015


Chambers UK - 2023–2024 (Up and Coming - Intellectual Property: Patent Litigation) 

IAM Patent 1000 - 2021–2023

JUVE Patent - 2022–2023 

The Legal 500 UK - 2020 (Rising Star - Pharmaceuticals and Biotechnology); 2021–2024 (Next Generation Partner - Intellectual Property: Patents & Life Sciences and Healthcare)

Legal Media Group Expert Guides (Rising Stars) - 2021–2022 (Life Sciences)

Managing IP EMEA Awards - 2022 (European Cross-border Patent Litigation Team of the Year for British American Tobacco; UK Impact Case of the Year for Dr Reddy’s Laboratories v Warner-Lambert Company)

Managing IP IP Stars - 2021 (Notable Practitioner); 2022–2023 (Patent Star)

Who’s Who Legal (WWL): IP - 2023 (recommended)

WIPR Leaders - 2021–2023

Best Lawyers: Ones to Watch - 2024 (Life Sciences Law)

Memberships & Affiliations

AIPPI: International Association for the Protection of Intellectual Property

EPLAW: European Patent Lawyers Association

The Law Society of England and Wales

The Law Society of New South Wales (Australia)


Admissions & Qualifications

  • 2017, Entitled to exercise Higher Rights of Audience (Civil Advocacy)
  • 2016, Admitted to Practice as a Solicitor of England and Wales
  • 2012, Admitted to Practice as a Solicitor in the Federal Courts of Australia
  • 2011, Admitted to Practice as a Solicitor of New South Wales, Australia


  • University of OxfordPostgraduate Diploma in Intellectual Property Law and Practice2016
  • College of Law, SydneyGraduate Diploma in Legal Practice2011
  • University of SydneyLL.B.First Class Honours2010
  • University of SydneyB.Sc., PharmacologyAdvanced2008