Location History:
- Sakai, JA (1977)
- Sakai, JP (1978 - 1987)
Company Filing History:
7 out of 158 
1 out of 1,112 Years Active: 1977-1987
Title: Seiji Matsumoto: Innovator in Magnetic Recording Technology
Introduction
Seiji Matsumoto is a prominent inventor based in Sakai, Japan, known for his significant contributions to the field of magnetic recording technology. With a total of seven patents to his name, Matsumoto has made remarkable advancements that enhance the performance of magnetic recording media.
Latest Patents
Matsumoto's latest patents include a magnetic recording medium and magnetic particles therefor. This invention discloses a magnetic recording medium comprising a nonmagnetic support and a magnetic layer provided thereon. The magnetic layer consists of a magnetic recording element and a binder, where the magnetic recording element mainly comprises acicular gamma-Fe2O3 particles. These particles have an average porosity of not more than 5% by volume, a specific surface area of 24 to 30 m²/g, and an X-ray diffraction intensity ratio at the face (210) to that at the face (311) of not more than 5%. This innovative magnetic recording medium boasts improved electromagnetic conversion characteristics, such as enhanced sensitivity and reduced noise. Another notable patent is a method of producing single crystalline, acicular α-ferric oxide. This method involves heating an aqueous suspension of ferric hydroxide at temperatures ranging from 100°C to 250°C at an alkaline pH, utilizing a growth regulating agent and α-ferric oxide seed crystals.
Career Highlights
Throughout his career, Seiji Matsumoto has worked with notable companies, including Sakai Chemical Industry Co., Ltd. and Hitachi Maxell, Limited. His work in these organizations has allowed him to develop and refine his innovative ideas in magnetic recording technology.
Collaborations
Matsumoto has collaborated with esteemed colleagues such as Kiyoshi Fukai and Tadashi Koga. These partnerships have contributed to the advancement of his research and the successful development of his patents.
Conclusion
Seiji Matsumoto's contributions to magnetic recording technology have significantly impacted the industry. His innovative patents and collaborations highlight his expertise and dedication to advancing this field.