Japan Supreme Court Rules AI Cannot Be Listed as Inventor on Patent Applications

Japan's Top Court Rejects AI Inventorship

Japan's Supreme Court has ruled that artificial intelligence cannot be listed as an inventor on patent applications. The court determined that under current law, the status of "inventor" is reserved exclusively for natural persons, meaning AI systems lack the legal capacity to hold inventorship rights.

This ruling concludes a legal challenge brought by Stephen Thaler, who sought to patent food containers and other items created by his AI system, DABUS. The Patent Office had previously rejected the application because Thaler refused to provide the name of a human inventor, and the Supreme Court has now upheld that decision.

Global Legal Consistency on AI Patents

Japan's decision aligns with a broader international legal consensus that AI cannot be an inventor. Similar rulings have been issued in the United States and other jurisdictions, establishing a consistent global standard that inventorship requires human agency.

• United States: The U.S. Federal Circuit has ruled that only human beings can be inventors. However, the USPTO has indicated that inventors may use AI tools in their process as long as a human is listed as the inventor.
• South Africa: Notably, South Africa is one of the few jurisdictions where a patent listing an AI as the inventor has been granted, though observers note that South Africa's patent examination process is less rigorous than those in the US or Japan.

Technical and Legal Implications

The ruling raises several critical questions regarding the future of intellectual property (IP) and the role of AI in the creative process.

The "Human-in-the-Loop" Requirement

Legal experts and commentators suggest that the ruling does not ban the use of AI in inventing, but rather clarifies who must be credited. As long as a human provides significant contribution or oversight and is listed as the inventor, the resulting patent may still be valid. This treats AI as a sophisticated tool—similar to a calculator or a notebook—rather than an independent creator.

Risks of "AI Slop" and Patent Flooding

There is a concern that if AI were allowed to be listed as an inventor, intellectual property offices could be overwhelmed by a massive volume of low-quality, AI-generated patent applications (often referred to as "AI slop"). Requiring a human name acts as a barrier to entry, ensuring a level of accountability and preventing the automated flooding of patent registries.

The Incentive and Accountability Gap

Critics of the current patent system argue that patents may not actually improve innovation efficiency. Furthermore, from a legal standpoint, AI lacks accountability; because an AI cannot be held liable or enter into contracts, it cannot logically own the benefits or rights associated with a patent.

Community Perspectives and Counterpoints

Discussion among technical professionals highlights a divide between the legal reality and the practical application of AI in engineering:

"What’s stopping inventors using ai from simply using their own names as authors and owners of the patents? I’m honestly unsure this addresses the core issue: big companies with lots of resources will keep on patenting ideas, if anything at a far higher rate than before."

Some argue that the ruling is a formality that will not stop the proliferation of AI-assisted patents, as many engineers already use AI tools without explicitly disclosing them in patent filings. Others view the litigation as a "publicity stunt" designed to test the boundaries of the law rather than a reflection of how most AI-assisted research is actually conducted.