Introduction: Kiyoshi Watanabe, an accomplished inventor based in Sendai, Japan, has made significant contributions to the field of permanent magnet technology. With a total of five patents to his name, Watanabe has focused on creating advanced materials that enhance the performance and efficiency of magnets, which are crucial in various technological applications.

Latest Patents: Among his latest innovations, Watanabe has developed two notable patents for permanent magnets with ultra-high coercive forces. These magnets exhibit a coercive force greater than 500 Oe, a residual magnetic flux density exceeding 5 kG, and a maximum energy product surpassing 2 MGOe. The composition of these magnets predominantly consists of 48 to 66.9 atomic percent of iron, 33 to 47 atomic percent of platinum, and 0.1 to 10 atomic percent of niobium. The unique crystal structure of these permanent magnets features an incomplete single γ1 phase within a face-centered tetragonal system, a result of specific compositions and heat treatments applied. The fabrication process involves heating an alloy of the aforementioned elements at temperatures ranging from 900°C to 1,400°C for durations of one minute to ten hours, followed by rapid quenching at speeds greater than 30°C per minute but slower than 2,000°C per second.

Career Highlights: Kiyoshi Watanabe is affiliated with the Research Institute of Electric and Magnetic Alloys, where he has focused his research on innovative materials. His dedication to advancing magnetic technology has earned him recognition within the engineering community. Watanabe's work reflects his commitment to developing high-performance materials that can contribute significantly to industrial applications and cutting-edge technologies.

Collaborations: Throughout his career, Watanabe has worked alongside colleagues such as the late Hakaru Masumoto. Their collaborative efforts have contributed to the development of magnetic technologies, further enhancing the impact of their research on the industry. Their combined expertise exemplifies the importance of teamwork in driving innovation.

Conclusion: Kiyoshi Watanabe stands out as a prominent inventor in the realm of permanent magnet technology. Through his patents and collaborations, he has played a vital role in pushing the boundaries of what is possible in magnetic materials. As technology continues to evolve, the implications of Watanabe's inventions will undoubtedly resonate across various fields, heralding a new era of innovation in magnet applications.

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