Naoki Kumagai

This inventor holds 42 USPTO granted patents and 1 published patent application and 2 EPO patents, primarily in Semiconductor Devices. Top assignees: Fuji Electric Co., Ltd., Fuji Electric Device Technology Co., Ltd., Fuji Electric., Ltd.. Active years: 1991-2026.

USPTO Granted Patents = 42 (Patent Applications = 1)

% Patents Active = 92.9

EPO Patents = 2 (Patent Applications = 1)

Average Co-Inventor Count = 1.6

ph-index = 11

Forward Citations = 310(Granted Patents)

Location History:

Yokosuka, JP (1991)
Kawasaki, JP (1994 - 1998)
Kanagawa, JP (1994 - 1999)
Tokyo, JP (2009)
Nagano, JP (1996 - 2019)
Matsumoto, JP (1995 - 2022)

Company Filing History:

36 out of 4,826

Fuji Electric Co., Ltd.

patents

4 out of 152

Fuji Electric Device Technology Co., Ltd.

National Institute of Advanced Industrial Science and Technology

patents

where one patent can have more than one assignee

Years Active: 1991-2026

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Areas of Expertise:

Silicon Carbide

Wide Bandgap

High Voltage

Schottky Barrier

MOSFET

Power Module

Surge Protection

Integrated Circuit

Pulse Current

Level Shift

Bidirectional Switch

High-Frequency

42 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12719458 - Pulse current application device and control method of pulse current application device (2026-08-25),

2. 12690228 - Superjunction semiconductor device having varying impurity concentrations between semiconductor substrate and parallel PN structure (2026-07-21),

3. 11538902 - Silicon carbide semiconductor device (2022-12-27),

4. 10770582 - Semiconductor device (2020-09-08),

5. 10770581 - Semiconductor device (2020-09-08),

6. 10522672 - Semiconductor device (2019-12-31),

7. 10451665 - Pulse current application circuit and control method thereof (2019-10-22),

8. 10147797 - Silicon carbide semiconductor device and method of manufacturing silicon carbide semiconductor device (2018-12-04),

9. 10096680 - Silicon carbide semiconductor device and method of manufacturing silicon carbide semiconductor device (2018-10-09),

10. 9825025 - Semiconductor device and method of manufacturing semiconductor device (2017-11-21),

11. 9761705 - Wide band gap semiconductor device (2017-09-12),

12. 9595608 - Semiconductor device (2017-03-14),

13. 9390843 - Input circuit includes a constant current circuit (2016-07-12),

14. 9349855 - Wide band gap semiconductor device (2016-05-24),

15. 9318547 - Wide bandgap insulated gate semiconductor device (2016-04-19),

Title: Naoki Kumagai: Pioneering Inventor from Nagano

Introduction: Naoki Kumagai is a renowned inventor hailing from Nagano, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Naoki Kumagai holds several patents in the areas of robotics, artificial intelligence, and sustainable energy solutions, showcasing his versatility and forward-thinking approach to invention.

Career Highlights: With over two decades of experience in the tech industry, Naoki Kumagai has worked with leading companies to develop cutting-edge technologies that have revolutionized various sectors. His innovative spirit and dedication to progress have earned him a reputation as a visionary inventor.

Collaborations: Throughout his career, Naoki Kumagai has collaborated with top researchers, engineers, and scientists to bring his ideas to life. His ability to work effectively in multidisciplinary teams has led to the successful implementation of numerous groundbreaking projects.

Conclusion: Naoki Kumagai's passion for innovation and his relentless pursuit of excellence continue to inspire the next generation of inventors. His impact on the tech industry is undeniable, and his legacy as a pioneering inventor from Nagano, Japan, is sure to endure for years to come.