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For the Inventor, By the Inventor

Aichi, Japan

Naotake Kumagai

This inventor holds 35 USPTO granted patents, primarily in Electric Vehicle Control. Top assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Jidosha Kogyo K.k.. Active years: 1979-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Naotake Kumagai. Retrieved from https://idiyas.com/inventor/naotake-kumagai

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

USPTO Granted Patents = 35

% Patents Active = 100.0

Average Co-Inventor Count = 3.5

ph-index = 15

Forward Citations = 697(Granted Patents)


Location History:

  • Nissincho, JP (1979)
  • Aichiken, JP (1979 - 1980)
  • Okazaki, JP (1985 - 1986)
  • Aichi, JP (1979 - 1989)
  • Yokohama, JP (1996)
  • Tokyo, JP (1997 - 1999)

Company Filing History:

goldMedal34 out of 1,649 
 
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
 patents
silverMedal2 out of 21,351 
 
Mitsubishi Denki Kabushiki Kaisha
 patents
bronzeMedal1 out of 26 
 
Mitsubishi Jidosha Kogyo K.k.
 patents
where one patent can have more than one assignee

Years Active: 1979-1999

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Areas of Expertise:
Electric Vehicle
Braking Control
Regenerative Control
Hybrid Electric Car
Suspension Apparatus
Automobile Suspension
Electronically Controlled Suspension
Capacity Meter
Air Conditioning System
Engine Control
Automobile Air-Conditioning
Display Device
35 patents (USPTO):Explore Patents
1. 5997107 - Regenerative control apparatus of electric vehicle, which obtains (1999-12-07),
2. 5879062 - Regenerative control apparatus of electric vehicle (1999-03-09),
3. 5839800 - Braking control system for electric automobile (1998-11-24),
4. 5775784 - Braking control system for electric automobile (1998-07-07),
5. 5670830 - Fuel use limiter-equipped hybrid electric car (1997-09-23),
6. 5664635 - Control system for inhibiting unintended use of hybrid electric vehicle (1997-09-09),
7. 5561362 - Remaining capacity meter and detection method for electric vehicle (1996-10-01),
8. 4846496 - Vehicle suspension apparatus (1989-07-11),
9. 4730843 - Vehicle suspension apparatus (1988-03-15),
10. 4697237 - Vehicle suspension apparatus (1987-09-29),
11. 4695074 - Vehicle suspension apparatus (1987-09-22),
12. 4673193 - Vehicle suspension apparatus (1987-06-16),
13. 4669750 - Vehicle suspension apparatus (1987-06-02),
14. 4669749 - Vehicle suspension apparatus (1987-06-02),
15. 4648622 - Suspension device for automobile (1987-03-10),

Title: Naotake Kumagai: Innovating Electric Vehicle Technology in Aichi, Japan

Introduction

Naotake Kumagai is a distinguished inventor based in Aichi, Japan, known for his remarkable contributions to the field of electric vehicles. With an impressive portfolio of 35 patents, he has dedicated his career to enhancing the efficiency and functionality of electric vehicle technology. His innovative designs are shaping the future of sustainable mobility.

Latest Patents

One of Kumagai's most notable recent innovations is the regenerative control apparatus for electric vehicles. This invention focuses on detecting the operating amount of the brake and setting the target value of regenerative torque accordingly. By continuously monitoring the change in the operating amount over time, the system dynamically adjusts the rise speed of the regenerative torque. This ensures that the regenerative torque is effectively controlled according to the set values, enhancing the overall performance of electric vehicles.

Career Highlights

Throughout his career, Naotake Kumagai has made significant strides while working with major companies such as Mitsubishi Jidosha Kogyo Kabushiki Kaisha and Mitsubishi Denki Kabushiki Kaisha. His role in these organizations allowed him to collaborate closely with other talented professionals and push the boundaries of electric vehicle technology, leading to innovative breakthroughs and advancements.

Collaborations

Kumagai's journey has been enriched by collaboration with esteemed colleagues like Minoru Tatemoto and Mitsuhiko Harara. Working alongside these talented individuals has fostered an environment of creativity and innovation, contributing to the successful development of multiple projects and patents in electric vehicle technology.

Conclusion

Naotake Kumagai continues to be a pivotal figure in the advancement of electric vehicles, with his innovative spirit and technical expertise driving the industry forward. His dedication to creating sustainable solutions through his patents exemplifies the impact that a single inventor can have on the future of mobility and 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]
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