Norimasa Yokoyama

This inventor holds 54 USPTO granted patents and 18 published patent applications, plus 1 CIPO patent and 42 EPO patents, primarily in Organic Electroluminescence (CPC class H01L). Top assignees: Hodogaya Chemical Co., Ltd., Shinshu University, Kyushu University. Active years: 1991-2024.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Norimasa Yokoyama. Retrieved from https://idiyas.com/inventor/norimasa-yokoyama

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

Calculating rank

USPTO Granted Patents = 54 (Patent Applications = 18)

% Patents Active = 68.5

CIPO Patents = 1 (Patent Applications = 1)

EPO Patents = 42 (Patent Applications = 48)

Average Co-Inventor Count = 4.2

ph-index = 4

Forward Citations = 86(Granted Patents)

Forward Citations (Not Self Cited) = 79(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Yamaguchi, JP (2011)
Ibaraki, JP (2012 - 2016)
Tsukuba, JP (2011 - 2017)
Tasukuba, JP (2018)
Tokyo, JP (1991 - 2024)

Company Filing History:

54 out of 328

Hodogaya Chemical Co., Ltd.

Universal Display Corporation

patents

where one patent can have more than one assignee

Years Active: 1991-2024

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Areas of Expertise:

Organic Electroluminescent Device

Phosphorescent Materials

Triphenylene Compounds

Amino Compounds

Pyrimidine Derivatives

Indenoindole Derivative

Benzotriazole Derivatives

Arylamine Compounds

Carbazole Ring Structure

Pyridoindole Ring Structure

Substituted Anthracene

Device Structures

54 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12089488 - Organic electroluminescent device (2024-09-10),

2. 11944004 - Organic electroluminescence element (2024-03-26),

3. 11056653 - Organic electroluminescence device (2021-07-06),

4. 10818844 - Organic electroluminescent device (2020-10-27),

5. 10797242 - Compound having substituted triphenylene ring structure, and organic electroluminescent device (2020-10-06),

6. 10593884 - Organic electroluminescent device (2020-03-17),

7. 10566543 - Pyrimidine derivative and organic electroluminescent devices (2020-02-18),

8. 10541369 - Compound having substituted bipyridyl group and pyridoinodole ring structure, and organic electroluminescent device (2020-01-21),

9. 10505119 - Organic electroluminescence device (2019-12-10),

10. 10497876 - Organic electroluminescent device (2019-12-03),

11. 10096779 - Pyrimidine derivatives and organic electroluminescent devices (2018-10-09),

12. 10059725 - Compound having triphenylsilyl group and triarylamine structure, and organic electroluminescent device (2018-08-28),

13. 10026903 - Compound having substituted triphenylene ring structure, and organic electroluminescent device (2018-07-17),

14. 9985216 - Indenoindole derivative and organic electroluminescent element (2018-05-29),

15. 9905770 - Compound having acridan ring structure, and organic electroluminescent device (2018-02-27),

Title: Norimasa Yokoyama: Innovator in Organic Electroluminescent Devices

Introduction

Norimasa Yokoyama is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of organic electroluminescent devices, holding a total of 54 patents. His innovative work has advanced the technology used in lighting and display systems.

Latest Patents

Yokoyama's latest patents include an organic electroluminescent device that features a capping layer made from a high refractive index material. This design excels in thin film stability and durability while ensuring no absorption in the blue, green, and red wavelength ranges. The device aims to enhance light extraction efficiency significantly. Another notable patent is for an organic electroluminescence element that includes a hole injection layer containing an arylamine compound and an electron acceptor. This element boasts high light emission efficiency and excellent durability, all while maintaining a low drive voltage.

Career Highlights

Throughout his career, Yokoyama has worked with notable organizations such as Hodogaya Chemical Co., Ltd. and Shinshu University. His experience in these institutions has allowed him to refine his expertise in organic materials and their applications in electroluminescent technology.

Collaborations

Yokoyama has collaborated with esteemed colleagues, including Shuichi Hayashi and Shigeru Kusano. These partnerships have contributed to the advancement of research and development in the field of organic electroluminescent devices.

Conclusion

Norimasa Yokoyama's innovative work in organic electroluminescent devices has made a significant impact on the industry. His numerous patents and collaborations highlight his dedication to advancing technology in this field.

Profile summary based on public USPTO records.