Location History:
- Chiba, JP (1984 - 1985)
- Funabashi, JP (1985 - 1993)
- Tokyo, JP (1993)
- Chiyoda, JP (1994)
Company Filing History:
8 out of 1,235 
1 out of 1,430 
Years Active: 1984-1994
Title: Masamichi Obitsu: Innovator in Zirconia Ceramics
Introduction
Masamichi Obitsu is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of materials science, particularly in the development of zirconia ceramics. With a total of 8 patents to his name, Obitsu's work has garnered attention for its innovative approaches and practical applications.
Latest Patents
One of Obitsu's latest patents involves a zirconia ceramic that is composed of crystals which scarcely undergo phase transformation from the tetragonal system to the monoclinic phase within the temperature range of 100°C to 300°C, even in the presence of water vapor or water. This zirconia ceramic comprises at least 93% by weight of partially stabilized zirconia, mainly composed of tetragonal crystals, and contains Y₂O₃ and ZrO₂ in a molar ratio ranging from 2/98 to 4.5/95.5, along with a balance of oxides selected from boron oxide, germanium oxide, and gallium oxide, with the boron oxide content being 1% by weight or less. Another notable patent focuses on the preparation of zirconia sintered bodies, which are produced by injection molding a zirconia composition that includes zirconia powder and an organic binder, followed by firing the molded composition. This method results in high-density sintered bodies that exhibit strength, white transparency, and smoothness, utilizing zirconia powder containing 2 to 10 mol% of yttria in solid solution form.
Career Highlights
Throughout his career, Masamichi Obitsu has worked with notable organizations, including Nissan Chemical Industries Limited and the Agency of Industrial Science and Technology. His expertise in zirconia ceramics has positioned him as a key figure in advancing material technologies.
Collaborations
Obitsu has collaborated with esteemed colleagues such as Takahiro Hori and Toyoji Koinuma, contributing to various projects that enhance the understanding and application of zirconia materials.
Conclusion
Masamichi Obitsu's innovative work in zirconia ceramics has led to significant advancements in material science. His patents reflect a commitment to improving the properties and applications of zirconia, making him a noteworthy inventor in this field.