Yasuhiro Sato wrote an article published in The Invention 2025 No.9. Yasu’s article, “The Power of a Single Notebook: How a Japanese Court Ruled on an Employee Invention Dispute by Identifying the Real Inventor” discusses a recent court decision regarding patent laws. Based on a detailed research notebook outlining the invention’s core principles and a conversation with the defendant, the court determined that the true inventor was a professor. The defendant had actually alleged in the initial court that the professor was not the inventor. This decision clearly demonstrates the importance of objective evidence in Japanese courts.