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For the Inventor, By the Inventor

Himeji, Japan

Kiyoshi Yabunaka

This inventor holds 15 USPTO granted patents. Top assignee: Mitsubishi Denki Kabushiki Kaisha. Active years: 1983-1988.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kiyoshi Yabunaka. Retrieved from https://idiyas.com/inventor/kiyoshi-yabunaka

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

USPTO Granted Patents = 15

% Patents Active = 100.0

Average Co-Inventor Count = 2.2

ph-index = 7

Forward Citations = 143(Granted Patents)


Location History:

  • Himeji, JP (1983 - 1987)
  • Hyogo, JP (1983 - 1988)

Company Filing History:

goldMedal15 out of 21,351 
 
Mitsubishi Denki Kabushiki Kaisha
 patents

Years Active: 1983-1988

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15 patents (USPTO):Explore Patents
1. 4736112 - Starter for an internal combustion engine (1988-04-05),
2. 4671125 - Engine starter with a planetary reduction gear (1987-06-09),
3. 4668871 - Auxiliary device driving starter motor (1987-05-26),
4. 4622930 - Engine starter protecting device (1986-11-18),
5. 4613761 - Starter dynamo (1986-09-23),
6. 4596159 - Starting system for internal combustion engine (1986-06-24),
7. 4590385 - Automatic starter (1986-05-20),
8. 4570583 - Engine starter protecting device (1986-02-18),
9. 4558992 - Pump device (1985-12-17),
10. 4558668 - Auxiliary power output device for an internal combustion engine (1985-12-17),
11. 4553441 - Starting system for internal combustion engine (1985-11-19),
12. 4543923 - Engine starter (1985-10-01),
13. 4497291 - Full economizer for vehicles (1985-02-05),
14. 4401252 - Method of connecting armature coil (1983-08-30),
15. 4369910 - Method of connecting armature coil of rotary machine (1983-01-25),

Title: Kiyoshi Yabunaka: Innovator in Engine Starter Technology

Introduction

Kiyoshi Yabunaka is a prominent inventor based in Himeji, Japan. He has made significant contributions to the field of engineering, particularly in the development of advanced engine starter technologies. With a total of 15 patents to his name, Yabunaka's work has had a lasting impact on the automotive industry.

Latest Patents

One of Yabunaka's latest patents is for a starter for an internal combustion engine. This innovative engine starter features a DC motor with a rotor shaft that is drivingly connected to an output shaft through a planetary reduction gear. The sun gear of the reduction gear is formed on the outer surface of the rotor shaft, while the ring gear is located on the inner surface of the yoke of the DC motor. A notable improvement in this design is the yoke, which has a support portion integrally formed to rotatably support a one-piece end of the output shaft connected to the rotor shaft. The yoke is preferably formed by deep drawing of mild steel. Additionally, a dust preventing member creates a labyrinth seal around the rotor shaft, effectively preventing dust from entering the motor from the reduction gear.

Career Highlights

Yabunaka is currently employed at Mitsubishi Electric Corporation, where he continues to innovate and develop new technologies. His work has been instrumental in enhancing the efficiency and reliability of engine starters, contributing to advancements in automotive engineering.

Collaborations

Throughout his career, Yabunaka has collaborated with notable colleagues, including Isao Hamano and Yoshifumi Akae. These partnerships have fostered a creative environment that has led to numerous successful projects and patents.

Conclusion

Kiyoshi Yabunaka is a distinguished inventor whose contributions to engine starter technology have made a significant impact on the automotive industry. His innovative designs and collaborative efforts continue to drive advancements in engineering.

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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