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Fujikin Inc.

USPTO Granted Patents = 448

% Expired Patents = 17.0

CIPO Patents = 1

EPO Patents = 8

Trademarks = 13

Forward Citations = 3,489

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316 inventors (with patents filed for the assignee):

Nobukazu Ikeda (183 out of 211 patents)

Kouji Nishino (140 out of 155 patents)

Michio Yamaji (123 out of 142 patents)

4. Tsutomu Shinohara (114 out of 121 patents)

5. Ryousuke Dohi (85 out of 95 patents)

6. Masaaki Nagase (70 out of 72 patents)

7. Kaoru Hirata (62 out of 65 patents)

8. Tomohiro Nakata (59 out of 61 patents)

9. Katsuyuki Sugita (45 out of 48 patents)

10. Tadayuki Yakushijin (37 out of 38 patents)

11. Takahiro Matsuda (31 out of 31 patents)

12. Yukio Minami (29 out of 38 patents)

13. Takashi Hirose (29 out of 43 patents)

14. Tadahiro Ohmi (27 out of 201 patents)

15. Akihiro Morimoto (27 out of 51 patents)

Core Competencies:

Valve

Pressure Sensor

Flow Rate Control

Fluid Supply

Density Measurement

Concentration Measurement

Diaphragm Valve

Electromagnetic Valve

Fluid Control Apparatus

Mass Flow Sensor

Vaporized Feed Device

Hybrid Valve

448 patents: Sort by Forward Citations

1. 12736139 - Valve device (2026-09-15),

2. D1142854 - Hybrid valve (2026-08-18),

3. 12663096 - Actuator, open/close valve mechanism, and fluid control device (2026-06-23),

4. 12618482 - Valve (2026-05-05),

5. 12523559 - Electrostatic capacitive pressure sensor for fluid pressure detection (2026-01-13),

6. 12523558 - Pressure sensor that mitigates zero drop phenomena (2026-01-13),

7. 12510179 - Valve control apparatus, valve control system, valve control method, and valve control program (2025-12-30),

8. 12494383 - Gas supply device and semiconductor manufacturing apparatus (2025-12-09),

9. 12492985 - Density measurement device (2025-12-09),

10. 12436548 - Flow rate control device, flow rate control device control method, and flow rate control device control program (2025-10-07),

11. 12435798 - Diaphragm valve and flow rate control device (2025-10-07),

12. 12424468 - Concentration measurement device (2025-09-23),

13. 12414712 - Information processing system (2025-09-16),

14. 12405182 - Cover component for pressure sensor, and pressure sensor device comprising same (2025-09-02),

15. 12398819 - Controller and vaporization supply device (2025-08-26),

Fujikin Inc., headquartered in Osaka, Japan, specializes in the development and manufacturing of fluid control devices. The company focuses on advanced technologies related to valves, pressure sensors, and flow rate control systems, catering to a variety of industries that require precise fluid management. Their expertise extends to diaphragm and electromagnetic valves, as well as solutions for fluid supply, density measurement, and concentration measurement, ensuring high performance and reliability in critical applications.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

448 Patents

#47 in Osaka

#409 in Japan

#2,125 in the World

Fujikin Inc.

Forward Citations = 3,489

316 inventors:

Nobukazu Ikeda (183 out of 211 patents)

Kouji Nishino (140 out of 155 patents)

Michio Yamaji (123 out of 142 patents)

4. Tsutomu Shinohara (114 out of 121 patents)

5. Ryousuke Dohi (85 out of 95 patents)

Please report any incorrect information to [email protected]

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