Yoshiharu Isaka

This inventor holds 18 USPTO granted patents. Top assignees: Yamaha Hatsudoki Kabushiki Kaisha, Yamaha Kogyo Hatsudoki Kabushiki Kaisha. Active years: 1976-1998.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshiharu Isaka. Retrieved from https://idiyas.com/inventor/yoshiharu-isaka

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

USPTO Granted Patents = 18

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 11

Forward Citations = 255(Granted Patents)

Location History:

Iwata, JA (1976)
Shizuoka, JP (1982 - 1984)
Iwata, JP (1988 - 1998)

Company Filing History:

17 out of 4,353

Yamaha Hatsudoki Kabushiki Kaisha

patents

1 out of 1

Yamaha Kogyo Hatsudoki Kabushiki Kaisha

patent

Years Active: 1976-1998

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18 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5794587 - Tumble valve for multi-valve engine (1998-08-18),

2. 5564383 - Tumble valve arrangement for engine (1996-10-15),

3. 5549088 - Induction system for engine (1996-08-27),

4. 5487365 - Induction system for engine (1996-01-30),

5. 5359972 - Tumble control valve for intake port (1994-11-01),

6. 5311848 - Induction system for engine (1994-05-17),

7. 5255649 - Intake air control system for the engine (1993-10-26),

8. 5233952 - Pump drive for engine (1993-08-10),

9. 5172786 - V belt type automatic transmission system (1992-12-22),

10. 5070686 - Vertical engine for walk behind lawn mower (1991-12-10),

11. 5000126 - Vertical engine for walk-behind lawn mower (1991-03-19),

12. 4766859 - Lubricating system for vertical shaft engine (1988-08-30),

13. 4727834 - Vertical engine for walk behind lawn mower (1988-03-01),

14. 4489802 - Exhaust system for motorcycles (1984-12-25),

15. 4484650 - Motorcycle mounted with V shaped engine (1984-11-27),

Title: The Innovative Contributions of Yoshiharu Isaka

Introduction

Yoshiharu Isaka is a prominent inventor based in Iwata, Japan. He has made significant contributions to the field of internal combustion engines, holding a total of 18 patents. His work focuses on enhancing engine efficiency and performance through innovative designs.

Latest Patents

Among his latest patents is the "Tumble Valve for Multi-Valve Engine." This invention features various embodiments of induction systems for three-intake-valve-per-cylinder internal combustion engines. The design allows for the intake valves and flow passages to generate a tumble motion in the inducted intake charge. Additionally, control valves are included to redirect flow and increase tumble action under low-speed, low-load conditions. Another notable patent is the "Tumble Valve Arrangement for Engine," which involves a single intake valve per cylinder engine. This design promotes stratification in the combustion chamber and generates a tumble action in the intake passage during specific operating conditions.

Career Highlights

Yoshiharu Isaka has worked with notable companies such as Yamaha Motor Co., Ltd. and Yamaha Kogyo Co., Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in engine technology.

Collaborations

Throughout his career, Isaka has collaborated with talented individuals, including Kiyohiko Oguri and Yukiharu Hosoi. These partnerships have contributed to the advancement of his inventions and the overall progress in engine design.

Conclusion

Yoshiharu Isaka's contributions to engine technology through his patents and collaborations highlight his role as an influential inventor in the automotive industry. His innovative designs continue to shape the future of internal combustion engines.

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]