Location History:
- late of Miyagi, JP (1989)
- late of Sendai, JP (1989)
Company Filing History:
Years Active: 1989
Title: The Innovations of Hakaru Masumoto: Pioneering Permanent Magnets
Introduction: Hakaru Masumoto, a distinguished inventor from Miyagi, Japan, made significant contributions to the field of permanent magnets. With a legacy comprising two notable patents, his work continues to influence the industry even after his passing.
Latest Patents: Masumoto's latest patents focused on Fc-Pt-Nb permanent magnets with ultra-high coercive forces. His inventions demonstrated impressive specifications, including a coercive force exceeding 500 Oe, a residual magnetic flux density greater than 5 kG, and a maximum energy product of larger than 2 MGOe. The chemical composition of these magnets consisted of approximately 48 to 66.9 Atm % of iron, 33 to 47 Atm % of platinum, and 0.1 to 10 Atm % of niobium. The crystal structure was characterized as an incomplete single γ1 phase within a face-centered tetragonal system, influenced by either the material composition or the applied heat treatment. Production involved heating an alloy at temperatures ranging from 900°C to 1,400°C for durations between one minute and ten hours, followed by rapid quenching at speeds faster than 30°C/minute but slower than 2,000°C/second.
Career Highlights: Masumoto's innovations were developed while he was affiliated with the Research Institute of Electric and Magnetic Alloys. His expertise in the manipulation of material properties for enhanced magnetic performance established him as a vital figure in the field of permanent magnets.
Collaborations: Throughout his career, Masumoto collaborated with notable colleagues, including Kiyoshi Watanabe and Hiroshi Matsushima. These partnerships enriched his research and contributed to the advancement of permanent magnet technology.
Conclusion: Hakaru Masumoto's dedication to innovation in permanent magnets has left an indelible mark on the industry. His patents not only highlight his technical expertise but also the potential for continued advancements in the field of electric and magnetic alloys. His work remains a cornerstone of modern magnet technology, inspiring future inventors and researchers.