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For the Inventor, By the Inventor

Hachioji, Japan

Toru Yamakawa

This inventor holds 13 USPTO granted patents. Top assignee: Fuji Jukogyo Kabushiki Kaisha. Active years: 1984-1989.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toru Yamakawa. Retrieved from https://idiyas.com/inventor/toru-yamakawa

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

USPTO Granted Patents = 13

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 7

Forward Citations = 111(Granted Patents)


Company Filing History:

goldMedal13 out of 2,208 
 
Fuji Jukogyo Kabushiki Kaisha
 patents

Years Active: 1984-1989

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13 patents (USPTO):Explore Patents
1. 4840246 - Power transmission control system for a four-wheel drive vehicle (1989-06-20),
2. 4662490 - Clutch system for an internal combustion engine provided with a (1987-05-05),
3. 4630704 - System for controlling a power transmission of a four-wheel drive vehicle (1986-12-23),
4. 4617840 - System for controlling a power transmission of a four-wheel drive vehicle (1986-10-21),
5. 4586583 - System for controlling a power transmission of a four-wheel drive vehicle (1986-05-06),
6. 4576061 - System for controlling the transmission of a four-wheel drive vehicle (1986-03-18),
7. 4560021 - Control system for a plurality of engine units (1985-12-24),
8. 4512301 - Internal combustion engine provided with a plurality of power units (1985-04-23),
9. 4493190 - Cooling system for an engine having a plurality of engine units (1985-01-15),
10. 4480612 - Internal combustion engine provided with a plurality of power units (1984-11-06),
11. 4442805 - Internal combustion engine provided with a plurality of power units (1984-04-17),
12. 4439989 - Internal combustion engine provided with a plurality of power units (1984-04-03),
13. 4430862 - Internal combustion engine for vehicles (1984-02-14),

Title: Toru Yamakawa: Innovator in Power Transmission Systems

Introduction

Toru Yamakawa is a prominent inventor based in Hachioji, Japan. He has made significant contributions to the field of power transmission systems, particularly for four-wheel drive vehicles. With a total of 13 patents to his name, Yamakawa continues to push the boundaries of automotive technology.

Latest Patents

One of Yamakawa's latest inventions is a power transmission control system designed for four-wheel drive vehicles. This innovative system includes a transmission that transmits engine power to the main driving wheels, along with a clutch that directs power to auxiliary driving wheels. The design features a hydraulic circuit for clutch operation and a solenoid-operated valve. Speed sensors are integrated to monitor the speeds of both main and auxiliary driving wheels, allowing for the detection of wheel slipping and vehicle speed. Additionally, a steering angle sensor detects large steering angles, enabling the system to engage or disengage the clutch based on vehicle conditions, thus providing two-wheel driving when necessary.

Career Highlights

Yamakawa's career has been marked by his dedication to advancing automotive technology. His work at Fuji Jukogyo Kabushiki Kaisha has positioned him as a key player in the development of innovative power transmission solutions. His expertise and inventive spirit have led to numerous advancements in vehicle performance and safety.

Collaborations

Throughout his career, Yamakawa has collaborated with notable colleagues, including Fujio Makita and Mitsuo Umezawa. These partnerships have fostered a creative environment that encourages the exchange of ideas and the development of groundbreaking technologies.

Conclusion

Toru Yamakawa's contributions to the field of power transmission systems exemplify his commitment to innovation in the automotive industry. His patents reflect a deep understanding of vehicle dynamics and a passion for enhancing driving experiences. As he continues to innovate, Yamakawa remains a significant figure in automotive 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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