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Citizen Holdings Company, Ltd.

USPTO Granted Patents = 450

EPO Patents = 92

Trademarks = 17

Forward Citations = 3,415

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431 inventors (with patents filed for the assignee):

Takashi Akiyama (28 out of 68 patents)

Masafumi Ide (24 out of 51 patents)

Sadato Imai (15 out of 55 patents)

4. Takakazu Yano (11 out of 30 patents)

5. Junji Miyashita (11 out of 50 patents)

6. Takashi Ihara (10 out of 19 patents)

7. Kaoru Yoda (10 out of 13 patents)

8. Nodoka Oyamada (9 out of 19 patents)

9. Katsutoshi Mukaijima (9 out of 22 patents)

10. Gen Matsushima (9 out of 10 patents)

11. Kenji Matsumoto (8 out of 81 patents)

12. Masafumi Yokoyama (8 out of 20 patents)

13. Akira Kato (8 out of 13 patents)

14. Hiroyuki Tsugaru (8 out of 11 patents)

15. Akinari Takada (8 out of 14 patents)

Core Competencies:

Light-Emitting Diode

LED Lighting Apparatus

Optical Device

Pressure Detection Device

Laser Projection Apparatus

Image Forming Device

Wrist Watch Technology

Semiconductor Light-Emitting Device

Portable Manipulation Input Device

Machine Tool Technology

LED Drive Circuit

Hairspring Material

450 patents: Sort by Forward Citations

1. 10429050 - Light-emitting apparatus having different packaging densities (2019-10-01),

2. 10361642 - Electronic device (2019-07-23),

3. 9945750 - Pressure detection device (2018-04-17),

4. 9786826 - LED light-emitting element (2017-10-10),

5. 9703282 - Portable manipulation command input device and apparatus equipped with manipulation command input device (2017-07-11),

6. 9606515 - Satellite radio-controlled watch (2017-03-28),

7. D778246 - Light emitting diode (2017-02-07),

8. RE46295 - Light-emitting diode apparatus (2017-01-30),

9. 9559083 - Semiconductor light-emitting device (2017-01-31),

10. 9529330 - Wrist watch oscillating step motor with sweep motion (2016-12-27),

11. 9527180 - Machine tool (2016-12-27),

12. 9512968 - LED module (2016-12-06),

13. D773075 - Light source (2016-11-29),

14. 9510407 - LED drive circuit (2016-11-29),

15. 9508910 - LED module (2016-11-29),

CITIZEN Holdings Company, Ltd. is a global leader in timekeeping and innovation. With a history dating back to 1918, the company designs, manufactures, and sells watches, including the renowned Citizen brand. CITIZEN Holdings operates through its various subsidiaries and offers a diverse range of timepieces, from classic to sporty and technologically advanced models. Committed to environmental sustainability, the company strives to create timepieces powered by Eco-Drive technology, harnessing light as the primary energy source. By embodying precision and elegance, CITIZEN continues to provide watches that inspire and enhance the lives of individuals worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

450 Patents

#178 in Tokyo

#394 in Japan

#2,051 in the World

Citizen Holdings Company, Ltd.

Forward Citations = 3,415

431 inventors:

Takashi Akiyama (28 out of 68 patents)

Masafumi Ide (24 out of 51 patents)

Sadato Imai (15 out of 55 patents)

4. Takakazu Yano (11 out of 30 patents)

5. Junji Miyashita (11 out of 50 patents)

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