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For the Inventor, By the Inventor

Yokosuka, Japan

Seishi Yasuhara

This inventor holds 50 USPTO granted patents, primarily in Fuel Injection Technology (CPC class 1233). Top assignees: Nissan Motor Company Limited, Diesel Kiki Co., Ltd., Ngk Spark Plug Company, Limited. Active years: 1976-1987.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Seishi Yasuhara. Retrieved from https://idiyas.com/inventor/seishi-yasuhara

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

Calculating rank
USPTO Granted Patents = 50

% Patents Active = 100.0

Average Co-Inventor Count = 1.3

ph-index = 14

Forward Citations = 636(Granted Patents)

Forward Citations (Not Self Cited) = 624(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Yokosuka, JA (1976)
  • Yakosuka, JP (1986)
  • Yokosuka, JP (1979 - 1987)
  • Yokohama, JP (1984 - 1987)
  • Kanagawa, JP (1987)

Company Filing History:

goldMedal48 out of 13,420 
 
Nissan Motor Company Limited
 patents
silverMedal2 out of 596 
 
Diesel Kiki Co., Ltd.
 patents
bronzeMedal2 out of 2,606 
 
Ngk Spark Plug Company, Limited
 patents
where one patent can have more than one assignee

Years Active: 1976-1987

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Areas of Expertise:
Fuel Injection
Diesel Engine
Control System
Glow Plug
Fuel Pump
Oil Deterioration
Idling Speed
Exhaust Gas Recirculation
Lubricating Oil
Injection Timing
Electronic Control
Position Detector
50 patents (USPTO):Explore Patents
1. 4671224 - Apparatus for controlling a power supply to a glow plug for a vehicular (1987-06-09),
2. 4661686 - Dual line ceramic glow plug (1987-04-28),
3. 4646070 - Oil deterioration detector method and apparatus (1987-02-24),
4. 4638782 - Apparatus for controlling fuel injection timing in a fuel injection pump (1987-01-27),
5. 4635594 - Method of applying electric current to glow plugs and device therefor (1987-01-13),
6. 4626230 - Device for sensing damage to a cogged belt (1986-12-02),
7. 4617902 - Apparatus for controlling fuel injection timing of fuel injection (1986-10-21),
8. 4616615 - Method and system for controlling idling speed for a Diesel engine (1986-10-14),
9. 4615316 - Control method and apparatus for protecting engine from excessive wear (1986-10-07),
10. 4597369 - Fuel cutoff apparatus for fuel injection pump for diesel engine (1986-07-01),
11. 4594979 - Fuel injection rate control system for an engine (1986-06-17),
12. 4594667 - Digital control system (1986-06-10),
13. 4567868 - Fuel injection system for an internal combustion engine (1986-02-04),
14. 4563133 - Fuel cut solenoid valve for fuel injection pump (1986-01-07),
15. 4542725 - Fuel injection rate control system for an internal combustion engine (1985-09-24),

Title: **Seishi Yasuhara: Innovator in Automotive Technology**

Introduction

Seishi Yasuhara is a prominent inventor based in Yokosuka, Japan, known for his significant contributions to automotive technology. With an impressive portfolio of 50 patents, Yasuhara has been at the forefront of developing innovative solutions that enhance the efficiency and performance of vehicular systems.

Latest Patents

Yasuhara's latest patents showcase his expertise in power supply systems for internal combustion engines. One notable invention is an **Apparatus for controlling a power supply to a glow plug for a vehicular internal combustion engine**. This apparatus is designed to preheat the glow plug, featuring a conventional power supply circuit alongside a cancel circuit that temporarily halts its function upon power connection.

Another significant patent is the **Dual line ceramic glow plug**, which integrates a ceramic heater as an incandescent body. This novel design incorporates an incandescent wire made from refractory metal embedded within sintered ceramic powder, ensuring durability and efficiency. The innovation includes a meticulously designed metal sheath and terminal fittings that enhance the functionality and reliability of the glow plug system.

Career Highlights

Throughout his career, Seishi Yasuhara has worked with notable companies in the automotive sector, including Nissan Motor Company Limited and Diesel Kiki Co., Ltd. His efforts have had a lasting impact on the industry, paving the way for advancements in vehicle technology.

Collaborations

Yasuhara has collaborated with talented professionals in his field, including colleagues Hiroshi Kondo and Hideyuki Saito. Their joint efforts have contributed to the successful development and patenting of cutting-edge automotive technologies.

Conclusion

Seishi Yasuhara's innovative spirit and dedication to advancing automotive technology are evident through his numerous patents and collaborations. His work will undoubtedly continue to influence the automotive industry for years to come.

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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