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Sumida Corporation

USPTO Granted Patents = 237

% Expired Patents = 19.8

EPO Patents = 128

Trademarks = 4

Forward Citations = 786

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129 inventors (with patents filed for the assignee):

Mitsugu Kawarai (27 out of 29 patents)

Hiroyuki Miyazaki (21 out of 63 patents)

Yoshiharu Yoshii (20 out of 22 patents)

4. Satoru Yamada (19 out of 111 patents)

5. Shinichi Sakamoto (17 out of 24 patents)

6. Juichi Oki (15 out of 15 patents)

7. Hitoshi Moriya (15 out of 17 patents)

8. Takanobu Rokuka (14 out of 14 patents)

9. Norikazu Mizuochi (13 out of 18 patents)

10. Kan Sano (12 out of 13 patents)

11. Tadayuki Fushimi (12 out of 13 patents)

12. Kei Tanaka (11 out of 11 patents)

13. Tomohiro Kajiyama (9 out of 9 patents)

14. Tsutomu Otsuka (9 out of 11 patents)

15. Masaki Saito (9 out of 49 patents)

Core Competencies:

Coil Component

Magnetic Field Measurement

Electronic Component

High-Frequency Device

Power Supply System

Transformer

Inductor

Measurement Device

Biostimulation

Manufacturing Method

Current Sensor

Antenna Device

237 patents: Sort by Forward Citations

1. 12746712 - Manufacturing method of coil component and coil component (2026-09-29),

2. 12695394 - Output stabilizing circuit and DC/DC converter circuit (2026-07-28),

3. 12656385 - Transformer turns number testing circuit (2026-06-16),

4. 12625206 - Digitizing device and digitizing method (2026-05-12),

5. 12625205 - Nuclear magnetic resonance sensing device and nuclear magnetic resonance sensing method (2026-05-12),

6. 12586715 - Coil component (2026-03-24),

7. 12584873 - Measurement device and measurement method (2026-03-24),

8. 12533510 - Electrical stimulator (2026-01-27),

9. 12500025 - Coil component (2025-12-16),

10. 12379428 - Magnetic field measurement apparatus and magnetic field measurement method (2025-08-05),

11. 12260984 - Coil component (2025-03-25),

12. 12248049 - High-frequency magnetic field generating device (2025-03-11),

13. 12233581 - Manufacturing method of coil component and coil component (2025-02-25),

14. 12230435 - Coil component (2025-02-18),

15. 12198849 - Method for manufacturing a transformer (2025-01-14),

Sumida Corporation, headquartered in Tokyo, Japan, specializes in the development and manufacturing of coil components essential for various electronic applications. The company focuses on advanced technologies in magnetic field measurement, high-frequency devices, and power supply systems, catering to diverse sectors including automotive and consumer electronics. With a commitment to innovation, Sumida plays a pivotal role in enhancing the performance and efficiency of electronic devices through its expertise in transformers, inductors, and measurement devices.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

Sumida Corporation

237 Patents

#314 in

#629 in

#3,631 in the World

Sumida Corporation

Forward Citations = 786

129 inventors:

Mitsugu Kawarai (27 out of 29 patents)

Hiroyuki Miyazaki (21 out of 63 patents)

Yoshiharu Yoshii (20 out of 22 patents)

4. Satoru Yamada (19 out of 111 patents)

5. Shinichi Sakamoto (17 out of 24 patents)

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