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For the Inventor, By the Inventor

Shizuoka, Japan

Toru Kitsunai

This inventor holds 6 USPTO granted patents and 3 EPO patents. Top assignee: Yamaha Hatsudoki Kabushiki Kaisha. Active years: 2008-2013.

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

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

Calculating rank
USPTO Granted Patents = 6

% Patents Active = 83.3

 

Average Co-Inventor Count = 2.3

ph-index = 3

Forward Citations = 28(Granted Patents)


Company Filing History:

goldMedal6 out of 4,364 
 
Yamaha Hatsudoki Kabushiki Kaisha
 patents

Years Active: 2008-2013

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6 patents (USPTO):Explore Patents
1. 8613374 - Cast part made of aluminum alloy, fuel tank, and production method for the same (2013-12-24),
2. 8105046 - Propeller for watercraft and outboard motor (2012-01-31),
3. 8083490 - Propeller for watercraft, outboard motor and watercraft including the same and the method for producing the same (2011-12-27),
4. 8079822 - Propeller for watercraft and outboard motor (2011-12-20),
5. 7677134 - Forged product and method of making the product (2010-03-16),
6. 7390023 - Motorcycle fuel tank (2008-06-24),

Title: Toru Kitsunai: Inventor in Aluminum Alloy and Marine Propulsion Technologies

Introduction

Toru Kitsunai is an inventor based in Shizuoka, Japan, associated with Yamaha Hatsudoki Kabushiki Kaisha. His work includes inventions involving cast aluminum alloys, vehicle fuel tanks, and watercraft propellers. The available information credits him with 6 patents.

Latest Patents

One of Kitsunai’s latest patents, “Cast Part Made of Aluminum Alloy, Fuel Tank, and Production Method for the Same,” concerns a vehicle fuel tank made from cast aluminum alloy. The invention aims to provide good ductility and toughness by heat-treating the alloy at approximately 350°C to 390°C, resulting in a Vickers hardness of about 70 HV or less.

Another patent, “Propeller for Watercraft and Outboard Motor,” addresses abrasion resistance. It describes a propeller with a blade and hub, made by casting aluminum alloy. The propeller’s surface is blast-treated and then anodized to form a protective oxide coating.

Career Highlights

Kitsunai’s listed inventions reflect engineering work focused on improving the performance and durability of aluminum components. His patents address both material properties and manufacturing processes, with applications in vehicle fuel systems and marine propulsion.

Collaborations

Kitsunai is associated with Yamaha Hatsudoki Kabushiki Kaisha. His listed coworkers include Yukihiro Kurimoto and Atsushi Hirose.

Conclusion

Toru Kitsunai’s patent work highlights practical innovations in cast aluminum alloy components, including fuel tanks and watercraft propellers, developed in connection with Yamaha Hatsudoki Kabushiki Kaisha.

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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