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Yokohama, Japan

Kyosan Electric Mfg. Co., Ltd.

USPTO Granted Patents = 68

EPO Patents = 30

Trademarks = 3

Forward Citations = 198

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57 inventors (with patents filed for the assignee):

Itsuo Yuzurihara (41 out of 45 patents)

Hiroshi Kunitama (12 out of 12 patents)

Toshiyuki Adachi (12 out of 12 patents)

4. Ryosuke Ohma (11 out of 11 patents)

5. Yu Hosoyamada (10 out of 13 patents)

6. Toshifumi Nishi (10 out of 10 patents)

7. Kenji Mizuno (10 out of 10 patents)

8. Tomonori Itagaki (10 out of 10 patents)

9. Tamotsu Yokoyama (10 out of 10 patents)

10. Satoshi Aikawa (8 out of 18 patents)

11. Tomohiro Yoneyama (7 out of 10 patents)

12. Shinichi Kodama (7 out of 7 patents)

13. Koichi Miyazaki (6 out of 6 patents)

14. Atsushi Takayanagi (5 out of 5 patents)

15. Ikuo Sakurai (3 out of 3 patents)

Core Competencies:

Power Conversion Device

High-Frequency Power Supply

DC Pulse Power Supply

DC/DC Converter

Onboard System

Train Control System

Impedance Matching Device

Radio Frequency Power Source

Arc Quenching Circuit

Class-D Amplifier

Pulsed High Frequency Monitor

Emergency Brake Control

68 patents: Sort by Forward Citations

1. 12512797 - Method for controlling high-frequency power supply device, and high-frequency power supply device (2025-12-30),

2. 12489356 - Power conversion device with current-auxiliary circuit (2025-12-02),

3. 12438540 - Switching module (2025-10-07),

4. 12355367 - Wideband RF power supply and control method (2025-07-08),

5. 12323074 - RF band power supply device and pulse width modulation control method (2025-06-03),

6. 12316285 - Switching module (2025-05-27),

7. 12040158 - High-frequency power supply device and output control method therefor (2024-07-16),

8. 12020840 - Reactor (2024-06-25),

9. 12018964 - Detection system (2024-06-25),

10. 12014899 - High-frequency power supply device and output control method therefor (2024-06-18),

11. 11929668 - DC pulse power supply device and magnetic saturation reset method for DC pulse power supply device (2024-03-12),

12. 11884313 - Railroad equipment state determination apparatus and railroad equipment state determination method (2024-01-30),

13. 11881777 - DC pulse power supply device (2024-01-23),

14. 11852665 - Pulsed high frequency monitor (2023-12-26),

15. 11799373 - DC pulse power supply device (2023-10-24),

Kyosan Electric Mfg. Co., Ltd. is a Japanese company specializing in the design, development, and manufacture of various electrical equipment and systems. With a history spanning over 100 years, Kyosan Electric has been a prominent player in the railway, automotive, and industrial markets. The company's product portfolio includes power supply systems, control systems, electrification equipment, and electronic devices. Kyosan Electric is committed to providing innovative solutions that contribute to the advancement of transportation and industries worldwide.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

68 Patents

#22 in Yokohama

#1,400 in Japan

#10,601 in the World

Yokohama, Japan

Kyosan Electric Mfg. Co., Ltd.

Forward Citations = 198

57 inventors:

Itsuo Yuzurihara (41 out of 45 patents)

Hiroshi Kunitama (12 out of 12 patents)

Toshiyuki Adachi (12 out of 12 patents)

4. Ryosuke Ohma (11 out of 11 patents)

5. Yu Hosoyamada (10 out of 13 patents)

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