Location History:
- Kaminagaya, JP (1983)
- Yokohama, JP (1983 - 1989)
- Kanagawa, JP (1991)
Company Filing History:
5 out of 13,408 
1 out of 134 Years Active: 1983-1991
Title: The Innovations of Sumio Hirao
Introduction
Sumio Hirao is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of internal combustion engines, holding a total of 5 patents. His work focuses on enhancing the efficiency and performance of engine components.
Latest Patents
One of Hirao's latest patents is for a piston designed for internal combustion engines. This innovative piston features an aluminum alloy body and a unique piston head that includes a cylindrical member and a ring-shaped member. The design allows for a shrink fit bonding, enhancing the mechanical strength of the connection between the piston body and the head. Another notable patent is for a swirl chamber intended for diesel engines. This design incorporates a dome-shaped ceramic insert that defines a portion of the swirl chamber, allowing both the fuel injector and the glow plug to extend through a single aperture.
Career Highlights
Throughout his career, Sumio Hirao has worked with prominent companies in the automotive industry, including Nissan Motor Company Limited and Atsugi Unisia Corporation. His experience in these organizations has contributed to his expertise in engine technology and innovation.
Collaborations
Hirao has collaborated with several talented individuals in his field, including Katsuhiro Kishida and Hirohiko Date. These partnerships have likely fostered a creative environment that has led to the development of his innovative patents.
Conclusion
Sumio Hirao's contributions to the field of internal combustion engines demonstrate his commitment to innovation and engineering excellence. His patents reflect a deep understanding of engine mechanics and a drive to improve performance.