Masaaki Yoshikawa

This inventor holds 25 USPTO granted patents, primarily in Internal Combustion Engines. Top assignee: Yamaha Hatsudoki Kabushiki Kaisha. Active years: 1982-2001.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaaki Yoshikawa. Retrieved from https://idiyas.com/inventor/masaaki-yoshikawa-9sd0mm4w

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

Calculating rank

USPTO Granted Patents = 25

% Patents Active = 100.0

Average Co-Inventor Count = 1.2

ph-index = 10

Forward Citations = 262(Granted Patents)

Company Filing History:

25 out of 4,359

Yamaha Hatsudoki Kabushiki Kaisha

patents

Years Active: 1982-2001

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Areas of Expertise:

Four-Stroke Engine

Variable Valve Timing

Combustion Chamber

Multi-Valve Engine

Ignition System

Lubrication System

Cylinder Head

Air Intake Device

Control Valve

Camshaft Control

Induction System

Fuel Injection

25 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6273047 - Four-stroke engine (2001-08-14),

2. 5954019 - Variable valve timing arrangement for engine (1999-09-21),

3. 5913298 - Valve timing system for engine (1999-06-22),

4. 5868113 - Engine combustion chamber and air intake device (1999-02-09),

5. 5845613 - Variable valve timing arrangement for internal combustion engine (1998-12-08),

6. 5765531 - Multi-valve engine (1998-06-16),

7. 5720255 - Control valve for multi-valve engine (1998-02-24),

8. 5718196 - Lubrication and camshaft control system for engine (1998-02-17),

9. 5687685 - Valve seat and method (1997-11-18),

10. 5685265 - Multi valve engine (1997-11-11),

11. 5551394 - Induction system for engine (1996-09-03),

12. 5307785 - Ignition system for multi-valve engine (1994-05-03),

13. 5279274 - Ignition system for multi-valve engine (1994-01-18),

14. 5094193 - Cylinder head cooling arrangement (1992-03-10),

15. 4957470 - Valve operating system for engine (1990-09-18),

Title: Innovations by Masaaki Yoshikawa: A Pioneer in Engine Technology

Introduction

Masaaki Yoshikawa is an esteemed inventor based in Iwata, Japan, recognized for his significant contributions to automotive engineering. With a total of 25 patents to his name, he has made remarkable advancements in the design and functionality of internal combustion engines, particularly in relation to their efficiency and performance.

Latest Patents

Among his latest innovations is a groundbreaking four-stroke engine. This compact small displacement automotive internal combustion engine features cylinder bores inclined to the vertical, complemented by a reentrant configured induction system. This system ensures long intake runners while keeping the engine's longitudinal width in the engine compartment nearly equal to its vertical height. Additionally, Yoshikawa's engine incorporates an improved accessory mounting arrangement that enhances overall functionality.

Another notable patent includes a variable valve timing arrangement for engines. This invention pertains to a twin overhead camshaft internal combustion engine that utilizes a variable valve timing mechanism on each camshaft. The mechanism is hydraulically operated by lubricant supplied through a bearing surface of the camshaft, thereby minimizing external conduits and connections while simplifying sealing.

Career Highlights

Masaaki Yoshikawa is currently affiliated with Yamaha Hatsudoki Kabushiki Kaisha, a company renowned for its innovation and quality in the automotive sector. His work within this dynamic environment has enabled him to push the boundaries of engine technology, culminating in an impressive array of patents that reflect his expertise and vision.

Collaborations

Throughout his career, Yoshikawa has collaborated with talented individuals such as Hironao Takahashi and Shigenobu Uchiyama. These partnerships have not only fostered innovation but have also contributed to the development of cutting-edge solutions within the realm of automotive engineering.

Conclusion

Masaaki Yoshikawa's contributions to the field of automotive engineering are notable, showcasing his dedication to innovation and excellence. With his extensive portfolio of patents and collaborative spirit, he continues to inspire advancements that shape the future of internal combustion engine technology.

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]