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For the Inventor, By the Inventor

Hitachi, Japan

Seiji Yonekura

This inventor holds 19 USPTO granted patents, primarily in Organic EL Displays. Top assignees: Hitachi, Ltd., Hitachi Setsubi Engineering Co., Ltd.. Active years: 1982-2005.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Seiji Yonekura. Retrieved from https://idiyas.com/inventor/seiji-yonekura

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

USPTO Granted Patents = 19

% Patents Active = 78.9

Average Co-Inventor Count = 5.1

ph-index = 11

Forward Citations = 354(Granted Patents)


Company Filing History:

goldMedal19 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 7 
 
Hitachi Setsubi Engineering Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1982-2005

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Areas of Expertise:
Organic EL Display
Color Filter
Ink-Jet Recording Head
Ink-Jet Recorder
High Precision Image Recording
Printer Device
Illumination Control
Automatic Door Control
Garage Door Operation
Ink Discharge Unit
Recording Apparatus
19 patents (USPTO):Explore Patents
1. 6849128 - Organic EL display and production device of color filter cross reference to related application (2005-02-01),
2. 6776844 - Organic EL display and production device of color filter (2004-08-17),
3. 6604816 - Ink-jet recording head and ink-jet recorder (2003-08-12),
4. 6557981 - Ink jet recorder (2003-05-06),
5. 6443560 - Recording head and inkjet recording device having separately arranged ink chambers and ink discharge unit (2002-09-03),
6. 6412916 - Ink jet printer (2002-07-02),
7. 6328426 - Printer device (2001-12-11),
8. 6286938 - Ink jet recording head and ink jet recording apparatus (2001-09-11),
9. 4922272 - High precision image recording apparatus (1990-05-01),
10. 4740817 - Picture recording apparatus (1988-04-26),
11. 4549092 - Control system for illumination lamp installed in building equipped with (1985-10-22),
12. 4405923 - Garage door control system (1983-09-20),
13. 4393342 - Door operation control apparatus (1983-07-12),
14. 4386398 - Automatic door control apparatus (1983-05-31),
15. 4383206 - Door operation control apparatus (1983-05-10),

Title: **Seiji Yonekura - Innovator in Organic EL Display Technology**

Introduction

Seiji Yonekura is a prominent inventor based in Hitachi, Japan, known for his significant contributions to the field of organic electroluminescent (EL) display technology. With a total of 19 patents to his name, Yonekura's work has had a substantial impact on the development of advanced display systems.

Latest Patents

Yonekura's latest patents include groundbreaking advancements in the production of organic EL displays and color filters. One notable patent describes a device for producing a color filter that utilizes a solution in which a light transmitting material is dissolved. The device features a part for storing the solution, a feeding mechanism to direct the solution to the tip of a flying electrode, and a method for applying a voltage to create an electrostatic field. This innovative approach allows for the precise formation of red, green, and blue light-emitting layers on a color filter substrate. Another significant patent involves an organic EL display production device that similarly utilizes a flying electrode to inject a light-emitting solution into concavities on an organic EL substrate, thereby creating vibrant display colors.

Career Highlights

Seiji Yonekura has made substantial contributions during his tenure at notable companies such as Hitachi, Ltd. and Hitachi Setsubi Engineering Co., Ltd. His expertise in display technologies has driven advancements that have shaped the consumer electronics landscape.

Collaborations

Throughout his career, Yonekura has collaborated with talented individuals in the field, including Shigeru Matsuoka and Takeshi Tokunaga. These collaborations have fostered innovative ideas and contributed to the success of multiple projects.

Conclusion

Seiji Yonekura's innovative work in organic EL display technology continues to influence the industry. With his 19 patents and collaborative efforts, he remains a key figure in the advancement of display systems, paving the way for future innovations in the field.

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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