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For the Inventor, By the Inventor

Yokohama, Japan

Sumio Hirao

This inventor holds 5 USPTO granted patents. Top assignees: Nissan Motor Company Limited, Atsugi Unisia Corp.. Active years: 1983-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Sumio Hirao. Retrieved from https://idiyas.com/inventor/sumio-hirao

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 5

% Patents Active = 100.0

Average Co-Inventor Count = 3.0

ph-index = 4

Forward Citations = 65(Granted Patents)


Location History:

  • Kaminagaya, JP (1983)
  • Yokohama, JP (1983 - 1989)
  • Kanagawa, JP (1991)

Company Filing History:

goldMedal5 out of 13,420 
 
Nissan Motor Company Limited
 patents
silverMedal1 out of 134 
 
Atsugi Unisia Corp.
 patents
where one patent can have more than one assignee

Years Active: 1983-1991

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5 patents (USPTO):Explore Patents
1. 5014604 - Piston for internal combustion engine (1991-05-14),
2. 4875444 - Swirl chamber for diesel engines and the like (1989-10-24),
3. 4659245 - Gas turbine (1987-04-21),
4. 4396822 - Welding wire for automatic arc welding (1983-08-02),
5. 4394560 - Covered electrode containing zirconium for shielded metal arc welding (1983-07-19),

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.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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