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Yokohama, Japan

Transphorm Japan, Inc.

USPTO Granted Patents = 30

Forward Citations = 421

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26 inventors (with patents filed for the assignee):

Atsushi Yamada (8 out of 54 patents)

Toshihide Kikkawa (6 out of 87 patents)

Yoshihiro Takemae (4 out of 159 patents)

4. Kenji Nukui (4 out of 5 patents)

5. Yoshitaka Watanabe (3 out of 10 patents)

6. Youichi Kamada (2 out of 8 patents)

7. Shinichi Akiyama (2 out of 21 patents)

8. Yuichi Minoura (2 out of 22 patents)

9. Toshihiro Ohki (2 out of 41 patents)

10. Kenji Kiuchi (2 out of 2 patents)

11. Ken Shono (2 out of 5 patents)

12. Shuichi Tomabechi (1 out of 12 patents)

13. Tetsuro Ishiguro (1 out of 18 patents)

14. Tadahiro Imada (1 out of 45 patents)

15. Masato Nishimori (1 out of 11 patents)

Core Competencies:

Compound Semiconductor Device

Manufacturing Method

DC-DC Regulator

Driver Circuit

Schottky Transistor

Bootstrap Circuit

Power Supply Unit

Field Plate

Active Region

Gate Electrode

Switching Circuit

30 patents: Sort by Forward Citations

1. 9818840 - Semiconductor device and manufacturing method of semiconductor device (2017-11-14),

2. 9685338 - Compound semiconductor device and method of manufacturing the same (2017-06-20),

3. 9640648 - Semiconductor device and manufacturing method of semiconductor device (2017-05-02),

4. 9620616 - Semiconductor device and method of manufacturing a semiconductor device (2017-04-11),

5. 9425268 - Compound semiconductor device and method of manufacturing the same (2016-08-23),

6. 9349805 - III-n device with dual gates and field plate (2016-05-24),

7. 9299822 - Semiconductor device and manufacturing method of semiconductor device (2016-03-29),

8. 9231075 - Semiconductor device including gate electrode provided over active region in p-type nitride semiconductor layer and method of manufacturing the same, and power supply apparatus (2016-01-05),

9. 9224848 - Compound semiconductor device and manufacturing method of the same (2015-12-29),

10. 9142658 - Compound semiconductor device and method of manufacturing the same (2015-09-22),

11. 9142638 - Semiconductor device and manufacturing method of semiconductor device (2015-09-22),

12. 9136107 - Semiconductor device and method for manufacturing semiconductor device (2015-09-15),

13. 9099545 - Compound semiconductor device and method of manufacturing same (2015-08-04),

14. 9099351 - Compound semiconductor device and method of manufacturing the same (2015-08-04),

15. 9059136 - Compound semiconductor device and method of manufacturing the same (2015-06-16),

Company Overview

Transphorm Japan, Inc. is a leading innovator in the field of power conversion technology, specializing in the development and manufacturing of high-performance gallium nitride (GaN) solutions. The company focuses on enhancing energy efficiency and reducing the size of power systems across various applications, including automotive, industrial, and consumer electronics. With a strong emphasis on research and development, Transphorm aims to advance the capabilities of power electronics, contributing to a more sustainable energy future.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

30 Patents

#44 in Yokohama

#2,306 in Japan

#21,888 in the World

Yokohama, Japan

Transphorm Japan, Inc.

Forward Citations = 421

26 inventors:

Atsushi Yamada (8 out of 54 patents)

Toshihide Kikkawa (6 out of 87 patents)

Yoshihiro Takemae (4 out of 159 patents)

4. Kenji Nukui (4 out of 5 patents)

5. Yoshitaka Watanabe (3 out of 10 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Transphorm Japan, Inc.. Retrieved from https://idiyas.com/company/transphorm-japan

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

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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