% Expired Patents = 50.0

Forward Citations = 16

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11 inventors (with patents filed for the assignee):

Naoki Onishi (3 out of 23 patents)

Tsukasa Kobata (2 out of 27 patents)

Akihiro Sakanashi (1 out of 3 patents)

4. Takumi Ariji (1 out of 10 patents)

5. Tomonori Abe (1 out of 5 patents)

6. Shuichi Mizusawa (1 out of 23 patents)

7. Hiroki Kimura (1 out of 9 patents)

8. Yu Iwai (1 out of 5 patents)

9. Yasuo Kitayama (1 out of 8 patents)

10. Takafumi Saitoh (1 out of 1 patent)

11. Motoki Ogawa (1 out of 1 patent)

8 patents: Sort by Forward Citations

1. 12756360 - Crystal unit with built-in temperature sensor (2026-10-06),

2. 12726177 - Quartz crystal device, crystal unit, and crystal oscillator (2026-09-01),

3. 12567851 - Base for piezoelectric device and piezoelectric device (2026-03-03),

4. 8156621 - Methods of producing piezoelectric vibrating devices (2012-04-17),

5. 7664535 - Control method for high-frequency radio equipment and high-frequency radio system (2010-02-16),

6. 7656208 - PLL oscillation circuit (2010-02-02),

7. 7508281 - Frequency synthesizer (2009-03-24),

8. 7489949 - Control method for high-frequency radio equipment and high-frequency radio system (2009-02-10),

Company Overview

Nihon Dempa Kogyo, Ltd. (NDK) is a leading manufacturer of high-precision crystal products including crystal oscillators, crystal filters, and crystal resonators. Founded in 1948, NDK has a strong reputation for quality and reliability in the electronics industry. With a focus on innovation and customer satisfaction, NDK continues to provide cutting-edge solutions for a wide range of industries.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

8 Patents

#2,151 in Tokyo

#5,049 in Japan

Tokyo, Japan

Nihon Dempa Kogyo, Ltd.

Forward Citations = 16

11 inventors:

Naoki Onishi (3 out of 23 patents)

Tsukasa Kobata (2 out of 27 patents)

Akihiro Sakanashi (1 out of 3 patents)

4. Takumi Ariji (1 out of 10 patents)

5. Tomonori Abe (1 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nihon Dempa Kogyo, Ltd.. Retrieved from https://idiyas.com/company/nihon-dempa-kogyo

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]