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Nihon Dempa Kogyo Co., Ltd.

USPTO Granted Patents = 631

CIPO Patents = 1

EPO Patents = 38

Trademarks = 10

Forward Citations = 1,983

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303 inventors (with patents filed for the assignee):

Fumio Asamura (38 out of 44 patents)

Shunichi Wakamatsu (38 out of 38 patents)

Takehiro Takahashi (37 out of 37 patents)

4. Kazuo Akaike (31 out of 31 patents)

5. Takeo Oita (29 out of 35 patents)

6. Hiroyuki Kukita (25 out of 25 patents)

7. Tsukasa Kobata (25 out of 27 patents)

8. Ryoichi Ichikawa (23 out of 24 patents)

9. Shuichi Mizusawa (22 out of 22 patents)

10. Kozo Ono (22 out of 23 patents)

11. Mitsuaki Koyama (20 out of 20 patents)

12. Naoki Onishi (20 out of 23 patents)

13. Tomoya Yorita (19 out of 19 patents)

14. Hidenori Harima (19 out of 19 patents)

15. Kouichi Moriya (17 out of 17 patents)

Core Competencies:

Sensor Module

Quartz-Crystal Vibrating Piece

Crystal Controlled Oscillator

Piezoelectric Device

Sensing Device

Crystal Unit

Oven-Controlled Crystal Oscillator

Ultrasonic Transducer

Crystal Resonator

Control Circuit

PLL Device

Substance Detection System

631 patents: Sort by Forward Citations

1. D1105936 - Sensor module (2025-12-16),

2. D1100684 - Sensor module (2025-11-04),

3. 12407321 - Quartz-crystal vibrating piece, crystal unit, crystal controlled oscillator, and intermediate wafer for quartz-crystal vibrating piece (2025-09-02),

4. 12388415 - Crystal unit, semimanufactured crystal unit, and method for manufacturing crystal unit (2025-08-12),

5. 12119777 - Control circuit (2024-10-15),

6. 12101075 - Piezoelectric device and manufacturing method of the same (2024-09-24),

7. 12028020 - Crystal oscillator (2024-07-02),

8. 11824516 - Piezoelectric device and manufacturing method of the same (2023-11-21),

9. 11626838 - Quartz crystal device, crystal unit, and crystal controlled oscillator (2023-04-11),

10. 11329210 - Sensing device (2022-05-10),

11. 11296674 - Quartz crystal device (2022-04-05),

12. 11296275 - Piezoelectric device, piezoelectric vibrating piece, and method for manufacturing piezoelectric vibrating piece (2022-04-05),

13. 11287399 - Sensing device (2022-03-29),

14. 11251773 - AT-cut crystal element, crystal unit, and semi-manufactured crystal unit (2022-02-15),

15. 11218131 - Crystal unit (2022-01-04),

Nihon Dempa Kogyo Co., Ltd. (NDK) is a leading manufacturer of electronic components based in Japan. Founded in 1948, NDK specializes in the production of quartz crystal devices and related products. With a rich heritage of over 70 years, NDK has established a strong reputation for its high-quality and innovative solutions. The company's product portfolio includes quartz crystal oscillators, filters, sensors, resonators, and timing devices used in a wide range of applications such as telecommunications, automotive, consumer electronics, and industrial equipment. NDK is committed to delivering cutting-edge technology and collaborating with customers to meet their evolving needs. For more information about NDK and its products, please visit their official website.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 23 2025

631 Patents

#133 in Tokyo

#308 in Japan

#1,521 in the World

Nihon Dempa Kogyo Co., Ltd.

Forward Citations = 1,983

303 inventors:

Fumio Asamura (38 out of 44 patents)

Shunichi Wakamatsu (38 out of 38 patents)

Takehiro Takahashi (37 out of 37 patents)

4. Kazuo Akaike (31 out of 31 patents)

5. Takeo Oita (29 out of 35 patents)

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