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For the Inventor, By the Inventor

Tokyo, Japan

Meidensha Corporation


USPTO Granted Patents = 312

% Expired Patents = 20.8



Trademarks = 5

Forward Citations = 779

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304 inventors (with patents filed for the assignee):

goldMedal Takao Akiyama (31 out of 38 patents)

silverMedal Toshimichi Takahashi (20 out of 21 patents)

bronzeMedal Nobuo Okazaki (16 out of 17 patents)

4.  Yugo Tadano (15 out of 15 patents)

5.  Takashi Yamaguchi (14 out of 90 patents)

6.  Akihiko Kodama (13 out of 13 patents)

7.  Toshinori Miura (11 out of 12 patents)

8.  Shota Hayashi (11 out of 11 patents)

9.  Keita Ishikawa (11 out of 30 patents)

10.  Kosuke Hasegawa (10 out of 10 patents)

11.  Kaoru Kitakizaki (10 out of 11 patents)

12.  Kazunobu Oi (10 out of 10 patents)

13.  Toshimasa Fukai (9 out of 20 patents)

14.  Yuji Ogawa (9 out of 35 patents)

15.  Masayasu Kanke (9 out of 11 patents)


Core Competencies:
Rotary Electric Machine
Power Conversion Device
Filtration System
Dynamometer System
Vacuum Interrupter
Vehicle Speed Control
Field Emission Device
Chassis Dynamometer
Elevator Monitoring
Bubble Generation Device
Atomic Layer Deposition
Motor Cooling System

312 patents:

1. 12734898 - Vehicle drive device (2026-09-15),
2. 12712462 - BIDIRECTIONAL ISOLATED DC- DC CONVERTER HAVING REDUCED VOLTAGE INCREASE FOR LEAKAGE INDUCTANCE OF TRANSFORMER (2026-08-18),
3. 12700548 - Vacuum capacitor (2026-08-04),
4. 12676515 - Rotary electric machine (2026-07-07),
5. D1127724 - Electric drive unit (2026-05-26),
6. 12630394 - Elevator rope inspection device and method for inspecting an elevator rope (2026-05-19),
7. D1119489 - Wheel fixing device (2026-03-24),
8. 12573899 - Rotary electric machine (2026-03-10),
9. 12549060 - Coolant flow passage structure in rotating machine (2026-02-10),
10. 12463497 - Rotating electrical machine (2025-11-04),
11. 12451755 - Rotary electric machine with stator and oil injection port (2025-10-21),
12. 12442702 - Dynamometer system (2025-10-14),
13. 12442427 - Reverse force mechanism (2025-10-14),
14. 12441182 - Vehicle speed control device and driver model processing device (2025-10-14),
15. 12440811 - Bubble generation device and liquid filtration device (2025-10-14),
Meidensha Corporation, headquartered in Tokyo, Japan, specializes in the development and manufacturing of advanced rotating machines and power conversion devices. The company is recognized for its expertise in rotary electric machines, filtration systems, and dynamometer systems, contributing significantly to various sectors including automotive and industrial applications. Meidensha also focuses on innovative technologies such as vacuum interrupters and field emission devices, enhancing vehicle speed control and overall system efficiency.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Oct 6 2026

Meidensha Corporation
312 Patents

#276 in Tokyo

#531 in Japan

#2,867 in the World

Tokyo, JP
Tokyo, Japan

Meidensha Corporation

Forward Citations = 779

304 inventors:

goldMedal Takao Akiyama (31 out of 38 patents)

silverMedal Toshimichi Takahashi (20 out of 21 patents)

bronzeMedal Nobuo Okazaki (16 out of 17 patents)

4.  Yugo Tadano (15 out of 15 patents)

5.  Takashi Yamaguchi (14 out of 90 patents)

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