This inventor holds 3 USPTO granted patents. Top assignee: Kabushiki Kaisha Toshiba. Active years: 1989-1993.
Company Filing History:
Years Active: 1989-1993
Title: Yoshiyuki Ohnuma: Innovator in Silicon Nitride Ceramics
Introduction
Yoshiyuki Ohnuma is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of materials science, particularly in the development of advanced silicon nitride ceramics. With a total of 3 patents to his name, Ohnuma's work has implications for various industrial applications.
Latest Patents
One of his latest patents is for a fiber-reinforced silicon nitride ceramic. This invention involves a unique composition that includes silicon nitride, a sintering additive, and silicon carbide fiber. The fiber has a length of 200 µm or more and is contained in a range of 5 to 50 wt %. The sintering additive, which is selected from a group of oxides, nitrides, and carbides, is contained in a range of 0.1 to 30 wt %. This innovative composition allows for the simultaneous achievement of high strength and large toughness values.
Another notable patent is for a silicon nitride-ceramic and its manufacturing method. This invention describes a sintered body that includes silicon nitride and an additive, characterized by a columnar crystal of β-type silicon nitride. The manufacturing process involves forming a first powder that includes a needle-shaped crystal of β-type silicon nitride and sintering it under a non-oxidation atmosphere.
Career Highlights
Yoshiyuki Ohnuma is currently employed at Kabushiki Kaisha Toshiba, where he continues to advance his research in materials science. His work has garnered attention for its potential applications in various industries, including electronics and aerospace.
Collaborations
Ohnuma has collaborated with notable colleagues such as Takeyuki Yonezawa and Yasuhiro Goto. Their combined expertise has contributed to the successful development of innovative materials and technologies.
Conclusion
Yoshiyuki Ohnuma's contributions to the field of silicon nitride ceramics highlight his role as a leading inventor in materials science. His patents reflect a commitment to innovation and the advancement of technology.