The US Patent and Trademark Office (USPTO) has clarified the role of AI in the invention process, stating that only humans can be considered inventors for patent purposes. According to USPTO Director John Squires, AI tools like ChatGPT and image generators are just instruments that assist human creators, much like a microscope or software. The new guidelines mark a shift from the previous administration's approach, which allowed for a "joint-inventor" status for AI-assisted inventions. Now, if an AI contributes to an idea, a human must still be the one who conceives it to qualify for a patent. This decision is significant as AI becomes increasingly integrated into innovation across various fields, including drug discovery and engineering design. The clear distinction provided by the USPTO means that inventions resulting from a human's idea with AI assistance can be patented, while those generated solely by AI cannot. This clarity benefits inventors and startups by emphasizing the importance of documentation. To secure a patent, inventors must demonstrate that a human brain initiated the creative process, not just an AI prompt. Looking ahead, while the USPTO has established these guidelines, the legal landscape may still evolve. Courts have consistently ruled that AI cannot hold patents, but the growing complexity of AI's role in generating ideas raises questions about how the law will adapt. As AI capabilities advance, legal challenges around this "tool" designation are likely to increase, prompting deeper discussions about machine creativity and its implications for patent law.