Naoto Kijima

This inventor holds 59 USPTO granted patents and 7 published patent applications and 11 EPO patents, primarily in Light Emitting Devices (CPC class H01L). Top assignees: Mitsubishi Chemical Corporation, Citizen Electronics Co., Ltd., Nichia Corporation. Active years: 1985-2024.

USPTO Granted Patents = 59 (Patent Applications = 7)

% Patents Active = 55.9

EPO Patents = 11 (Patent Applications = 12)

Average Co-Inventor Count = 3.3

ph-index = 14

Forward Citations = 614(Granted Patents)

Forward Citations (Not Self Cited) = 542(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Tokyo, JP (1987)
Machida, JP (1985 - 2015)
Anan, JP (2023)
Yokohama, JP (1991 - 2024)
Kanagawa, JP (2008 - 2024)

Company Filing History:

44 out of 2,420

Mitsubishi Chemical Corporation

patents

4 out of 608

Citizen Electronics Co., Ltd.

Mitsubishi Chemical Industries Limited

patents

6. 3 out of 499

Mitsubishi Kasei Corporation

patents

7. 2 out of 575

National Institute for Materials Science

9. 2 out of 834,411

Other

patents

where one patent can have more than one assignee

Years Active: 1985-2024

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Areas of Expertise:

Light Emitting Device

Phosphor

Illuminating Device

Color Image Display

Wavelength Conversion

Backlight

Nitrogen-Containing Compound

Multinary Oxynitride

Alloy Powder

Production Method

White Light

Color Filter

59 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12084609 - Light emitting device (2024-09-10),

2. 11993240 - Controller and control method (2024-05-28),

3. 11873435 - Light emitting device (2024-01-16),

4. 11643595 - Wavelength conversion member, light-emitting device, and image display device (2023-05-09),

5. 11613698 - Illumination device (2023-03-28),

6. 10858582 - Semiconductor light emitting device, backlight, color image display device and phosphor to be used for them (2020-12-08),

7. 10011769 - Semiconductor light emitting device, backlight, color image display device and phosphor to be used for them (2018-07-03),

8. 9541238 - Semiconductor light emitting device, backlight, color image display device and phosphor to be used for them (2017-01-10),

9. 9120974 - Phosphor and light-emitting device using same (2015-09-01),

10. 9028718 - Light-emitting device, white light-emitting device, illuminator, and image display (2015-05-12),

11. 8992797 - Phosphor and production method thereof, phosphor-containing composition, light emitting device, illuminating device, display, and nitrogen-containing compound (2015-03-31),

12. 8890403 - White light-emitting device and illumination device (2014-11-18),

13. 8884514 - Phosphor composition, light-emitting device having the same, cured product having the same, lighting system having the same, and display having the same (2014-11-11),

14. 8828272 - Phosphor, method for producing phosphor, phosphor-containing composition, light-emitting device, lighting system and image display device (2014-09-09),

15. 8801970 - Europium- and strontium-based phosphor (2014-08-12),

Title: The Innovative Contributions of Naoto Kijima

Introduction

Naoto Kijima, based in Yokohama, Japan, is a renowned inventor known for his significant contributions to the field of semiconductor technology. With an impressive portfolio of 58 patents, Kijima has established himself as a key figure in the development of advanced light-emitting devices that enhance color reproducibility and image brightness.

Latest Patents

His latest innovations include a groundbreaking light-emitting device designed to provide a semiconductor light emitting device capable of accomplishing broad color reproducibility for an entire image without compromising brightness. This device utilizes a combination of a solid light-emitting component that emits light in blue, deep blue, or ultraviolet regions, along with phosphors that comprise both green and red emitting elements. Importantly, these phosphors are engineered to maintain optimal emission characteristics under varying temperatures, ensuring consistent performance.

Career Highlights

Throughout his career, Kijima has been associated with notable companies such as Mitsubishi Chemical Corporation and Citizen Electronics Co., Ltd. His work has not only advanced the technologies of these organizations but also set new standards in the industry for light-emitting devices.

Collaborations

Kijima’s innovative journey has been enriched by collaborations with esteemed professionals like Yasuo Shimomura and Hideaki Kaneda. These partnerships have facilitated the exchange of ideas and led to the acceleration of cutting-edge developments within the semiconductor field.

Conclusion

In conclusion, Naoto Kijima’s extensive contributions to the realm of semiconductor light-emitting devices exemplify the power of innovation and collaboration in technology. His patents continue to influence the landscape, proving that dedicated inventors play a pivotal role in shaping the future of imaging technology.