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For the Inventor, By the Inventor

Kisarazu, Japan

Takahiro Fujiyama

This inventor holds 39 USPTO granted patents and 12 published patent applications and 10 EPO patents, primarily in Organic Electroluminescence. Top assignees: Idemitsu Kosan Company, Limited, Samsung Electronics Co., Ltd., Mitsui Chemicals, Inc.. Active years: 1999-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takahiro Fujiyama. Retrieved from https://idiyas.com/inventor/takahiro-fujiyama

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

USPTO Granted Patents = 39 

% Patents Active = 89.7

 

Average Co-Inventor Count = 3.8

ph-index = 5

Forward Citations = 108(Granted Patents)


Location History:

  • Sodegaura, JP (1999 - 2012)
  • Chiba, JP (2015 - 2018)
  • Osaka, JP (2018)
  • Kisarazu, JP (2010 - 2023)
  • Yokohama, JP (2000 - 2024)
  • Yao, JP (2015 - 2024)
  • Kanagawa, JP (2024)

Company Filing History:

goldMedal20 out of 2,283 
 
Idemitsu Kosan Company, Limited
 patents
silverMedal11 out of 132,108 
 
Samsung Electronics Co., Ltd.
 patents
bronzeMedal7 out of 1,817 
 
Mitsui Chemicals, Inc.
 patents
4. 1 out of 91 
 
Idemitsu Kosan., Ltd.
 patents
5. 1 out of 1,008 
 
Mitsui Petrochemical Industries, Ltd.
 patents
6. 1 out of 73 
 
Yamamoto Chemicals, Inc.
 patents
where one patent can have more than one assignee

Years Active: 1999-2026

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Areas of Expertise:
Copolymers
Quantum Dots
Aromatic Amines
Electroluminescent Devices
Organic Electronics
Thin Films
Liquid Crystals
Organic Transistors
Heterocyclic Derivatives
Light-Emitting Devices
39 patents (USPTO):Explore Patents
1. 12753145 - Aromatic amine derivative, and organic electroluminescent element using same (2026-10-06),
2. 12466947 - Copolymer, electroluminescence device material including copolymer, and electroluminescence device (2025-11-11),
3. 12384965 - Copolymer, electroluminescent device material including copolymer, and electroluminescent device (2025-08-12),
4. 12274162 - Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic apparatus (2025-04-08),
5. 12173114 - Copolymer, electroluminescence device material including copolymer, and electroluminescence device (2024-12-24),
6. 12063851 - Nitrogenated aromatic heterocyclic derivative and organic electroluminescent element using same (2024-08-13),
7. 11997917 - Quantum dot electroluminescence device (2024-05-28),
8. 11974494 - Polymer compound, composition including the polymer compound, light-emitting device including the polymer compound (2024-04-30),
9. 11939422 - Copolymer, electroluminescence device material including copolymer, and electroluminescence device (2024-03-26),
10. 11917899 - Arylamine-fluorene alternating copolymer, electroluminescence device material, and electroluminescence device using the polymer (2024-02-27),
11. 11910697 - Copolymer, electroluminescence device material including copolymer, and electroluminescence device (2024-02-20),
12. 11758800 - Polymer material, material for electroluminescence device, liquid composition, thin film, and electroluminescence device (2023-09-12),
13. 11631815 - Quantum dot electroluminescence device (2023-04-18),
14. 11616200 - Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic apparatus (2023-03-28),
15. 11444246 - Aromatic amine derivative, and organic electroluminescent element using same (2022-09-13),

Title: Takahiro Fujiyama: A Pioneer in Electroluminescent Materials

Introduction

Takahiro Fujiyama, based in Kisarazu, Japan, is a distinguished inventor widely recognized for his innovative contributions to the field of electroluminescence. With an impressive portfolio of 35 patents, Fujiyama's work has significantly advanced the technology of organic light-emitting devices.

Latest Patents

Among his latest patents, Fujiyama's innovations include a copolymer designed for use in electroluminescence device materials. This copolymer features specific structural units represented by Chemical Formula 1 and Chemical Formula 2, incorporating distinctive components that enhance performance. Furthermore, he has developed a nitrogenated aromatic heterocyclic derivative that utilizes an indenocarbazole or indenoindole skeleton, directly or indirectly bonded to dibenzofuran or dibenzothiophene. This derivative is instrumental in creating organic EL devices that offer high emission efficiency and a prolonged lifespan.

Career Highlights

Takahiro Fujiyama has held key positions at notable companies, including Idemitsu Kosan Company, Limited and Samsung Electronics Co., Ltd. His work at these prestigious organizations has allowed him to be at the forefront of research and development in cutting-edge technologies.

Collaborations

Throughout his career, Fujiyama has collaborated with prominent colleagues, such as Tomoki Kato and Nobuhiro Yabunouchi. These partnerships have facilitated the exchange of ideas and fostered advancements in the realm of electroluminescent materials.

Conclusion

Takahiro Fujiyama stands as a significant figure in the field of innovations related to electroluminescence. His numerous patents and collaborations highlight his commitment to enhancing the efficiency and longevity of organic devices, making lasting contributions to technological advancements.

Profile summary based on public USPTO records.
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]
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