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For the Inventor, By the Inventor

Niiza, Japan

Haruhiko Yoshikawa

This inventor holds 8 USPTO granted patents. Top assignee: Honda Giken Kogyo Kabushiki Kaisha. Active years: 1988-2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Haruhiko Yoshikawa. Retrieved from https://idiyas.com/inventor/haruhiko-yoshikawa

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

USPTO Granted Patents = 8

% Patents Active = 87.5

Average Co-Inventor Count = 3.6

ph-index = 5

Forward Citations = 60(Granted Patents)


Location History:

  • Niiza, JP (1988 - 1989)
  • Saitama-ken, JP (1997)
  • Saitama, JP (1997 - 2004)

Company Filing History:

goldMedal8 out of 10,092 
 
Honda Giken Kogyo Kabushiki Kaisha
 patents

Years Active: 1988-2004

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8 patents (USPTO):Explore Patents
1. 6767311 - Vehicle starting clutch control device (2004-07-27),
2. 5669280 - Hydraulic control apparatus (1997-09-23),
3. 5630492 - Oil supplying and discharging structure for canceller in hydraulic clutch (1997-05-20),
4. 4875450 - Ignition timing controlling device for an internal combustion engine (1989-10-24),
5. 4846128 - Ignition timing control system for internal combustion engine (1989-07-11),
6. 4748952 - Ignition timing control system for internal combustion engine (1988-06-07),
7. 4745902 - Ignition timing control method for internal combustion engine (1988-05-24),
8. 4741310 - Ignition timing control system for internal combustion engine (1988-05-03),

Title: Innovator Spotlight: Haruhiko Yoshikawa

Introduction

Haruhiko Yoshikawa, an accomplished inventor based in Niiza, Japan, has made significant contributions to the automotive industry with his innovative designs. With a total of eight patents to his name, his work focuses on enhancing vehicle performance and control systems, particularly relating to hydraulic systems in vehicular transmissions.

Latest Patents

One of Yoshikawa's notable patents is the Vehicle Starting Clutch Control Device, which precisely manages the transmission torque capacity of a starting clutch. This innovative device is designed to transmit torque equal to the engine's absorption torque during power-off running. By controlling the gradual increase of clutch torque, it effectively prevents surging vibrations, particularly when the accelerator pedal is abruptly depressed.

Another key patent from Yoshikawa is the Hydraulic Control Apparatus, which serves as a vital component for hydraulically operated vehicular transmissions. This apparatus includes control valves that regulate the supply and discharge of hydraulic oil to the engaging elements within the transmission. The system incorporates an oil supply passage connected to a hydraulic oil source, featuring check valves that facilitate hydraulic oil flow exclusively from the supply passage to the downstream hydraulic engaging elements.

Career Highlights

Haruhiko Yoshikawa is currently employed at Honda Giken Kogyo Kabushiki Kaisha, a leading company in the automotive sector. His expertise in hydraulic systems contributes significantly to Honda's advancements in vehicle technology, notably within their innovative transmission solutions.

Collaborations

Throughout his career, Yoshikawa has worked alongside esteemed colleagues such as Makoto Kawai and Shizuo Yagi. Their collaborative efforts have fostered a rich environment for innovation and development in automotive technology.

Conclusion

Haruhiko Yoshikawa stands out as a prominent inventor within the automotive industry, consistently pushing the boundaries of technology with his patented innovations. His work not only enhances vehicle performance but also sets the stage for future advancements 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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