Company Filing History:
2 out of 149 
1 out of 151 
Years Active: 2019-2022
Title: The Innovations of Hideyuki Yoshikawa
Introduction
Hideyuki Yoshikawa is a notable inventor based in Sendai, Japan. He has made significant contributions to the field of materials science, particularly in the development of rare earth cobalt-based permanent magnets. With a total of 2 patents to his name, Yoshikawa's work has implications for various technological applications.
Latest Patents
Yoshikawa's latest patents focus on the formulation and structure of rare earth cobalt permanent magnets. One of his patents describes a rare-earth cobalt permanent magnet that contains 23 to 27 mass % R, 3.5 to 5.0 mass % Cu, 18 to 25 mass % Fe, 1.5 to 3.0 mass % Zr, and a remainder of Co with inevitable impurities. This magnet exhibits excellent magnetic properties and features a metal structure with a plurality of crystal grains and a continuously extending grain boundary. The content of Cu and Zr in the grain boundary is higher than in the crystal grains, enhancing the magnet's performance. Another patent elaborates on a similar composition, emphasizing the presence of a cell phase containing SmCo and a surrounding cell wall.
Career Highlights
Throughout his career, Yoshikawa has worked with prominent organizations such as Tokin Corporation and Kyushu Institute of Technology. His experience in these institutions has allowed him to refine his expertise in magnet technology and materials science.
Collaborations
Yoshikawa has collaborated with notable colleagues, including Teruhiko Fujiwara and Hiroaki Machida. These partnerships have contributed to the advancement of his research and the successful development of his patents.
Conclusion
Hideyuki Yoshikawa's contributions to the field of rare earth cobalt-based permanent magnets highlight his innovative spirit and dedication to advancing technology. His patents reflect a deep understanding of materials science and its applications in modern technology.