Thaler v Comptroller General – an AI system cannot be an inventor

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Thaler v Comptroller General – an AI system cannot be an inventor

Sponsored by

twobirds-400px.jpg
Creative light bulb illustration with human brain and with man hand writing in diary on background, future technology concept. Multiexposure

In the first English court decision to consider the issue of AI inventorship, the High Court has held that an AI system cannot be considered an inventor under the Patent Act 1977.

In the first English court decision to consider the issue of AI inventorship, the High Court has held that an AI system cannot be considered an inventor under the Patent Act 1977.

Background

DABUS is a "creativity machine" created by Dr Stephen Thaler. Trained in the general knowledge of a particular field, its purpose is to independently conceive of new ideas and identify them as novel and salient. In short, DABUS is intended to be a machine capable of making inventions. In 2018, Dr Thaler filed two patent applications with the UKIPO seeking to obtain patent protection for outputs generated by DABUS. The applications listed Dr Thaler as the applicant. In documents subsequently filed with the UKIPO, Dr Thaler stated that DABUS was the inventor, and he was entitled to apply for the patents as DABUS' owner. In December 2019, the UKIPO rejected both applications, holding that Dr Thaler had failed to meet the requirement under Section 13 of the Patents Act 1977 to identify the person who he believed to be the inventor, and indicate how he derived his right to be granted a patent for the inventions.

Appeal to the High Court

Dr Thaler appealed the UKIPO decision to the High Court, maintaining that he had complied with Section 13 by identifying who he believed to be the inventor (DABUS) and how he derived his right to be granted a patent for the invention (by virtue of his ownership of DABUS). Smith J rejected the appeal in relation to Section 13, holding that Dr Thaler's subjective belief in the identity of the inventor was not sufficient. Instead, statements regarding inventorship and entitlement to apply under Section 13 must be capable of justification in the terms of the scheme set out by Section 7 of the Patents Act. In reaching this conclusion, Smith J emphasised that Section 7 provides an exhaustive code for determining who is entitled to the grant of a patent.

Who can be an "inventor" under Section 7 of the Patents Act?

Addressing Section 7, Smith J found a number of reasons why the term "inventor" under the Patents Act must be limited to natural persons. The foremost among these was that Section 7(3) specified that the inventor was the "actual deviser" of the invention, which had been interpreted by the House of Lords in Yeda v Rhone-Poulenc [2007] UKHL 43 as the "natural person who came up with the inventive concept." This did not extend to legal persons or to things, such as AI systems, with no legal personality.

Did Dr Thaler have the right to apply for the patents?

As DABUS could not be an inventor for the purposes of the Patent Act, Dr Thaler was not entitled to apply for the patents under Section 7. He did not claim to be the inventor himself, and DABUS was not a person capable of owning the right to apply itself or transferring it to Dr Thaler. There was nothing to be transferred to him and no person capable of transferring it.

Appeals have been filed by Dr Thaler in relation to the UK and EPO decisions.


Toby Bond

 

more from across site and SHARED ros bottom lb

More from across our site

With rankings for Western Europe set to be published on June 25, we sat down with our research lead to find out what practitioners and law firms can expect
Peter O’Sullivan, a professional services executive, says he is looking forward to helping Pearce IP become the leading life sciences firm in Australia and New Zealand
Matteo Di Lernia, advocate at LCA Studio Legale, unpicks the CJEU’s ruling in M.M. Ristorazione v Villa Ramazzini, including its impact on litigation strategies
Leaders at IP boutique say the decision to pursue sponsorless partnership with the specialised investment arm of a private equity firm comes at a time of ‘profound transformation’ in the profession
Patrick Zhang, formerly of Atlassian and TiVo, will become Via’s vice president of licensing and commercial strategy, tasked with helping expand client partnerships and licensing deals
IP services firm says new platform will cut patent portfolio analysis from months to minutes and optimise monetisation efforts
New role for the High Court judge will leave a gap for an IP specialist judge at the first instance
Laura Achával, founder of Achával IP in Argentina, shares how an evolving vision led her to launch her own practice
Monetisation is standing at the forefront of patent development, and one firm says AI is increasingly being deployed
Data centres are being built across the US, prompting patent disputes, but Texas’s thriving tech industry and patent-ready courts make the state particularly ‘ripe’ for litigation
Gift this article