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For the Inventor, By the Inventor

Tochigi, Japan

Katsuo Shirai

This inventor holds 11 USPTO granted patents. Top assignees: Nippon Precision Circuits Inc., Seikosha Co., Ltd.. Active years: 1990-1992.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsuo Shirai. Retrieved from https://idiyas.com/inventor/katsuo-shirai

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

USPTO Granted Patents = 11

% Patents Active = 100.0

Average Co-Inventor Count = 4.2

ph-index = 7

Forward Citations = 129(Granted Patents)


Company Filing History:

goldMedal11 out of 100 
 
Nippon Precision Circuits Inc.
 patents
silverMedal11 out of 696 
 
Seikosha Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1990-1992

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11 patents (USPTO):Explore Patents
1. 5122849 - Silicon thin film transistor (1992-06-16),
2. 5121178 - Silicon thin film transistor (1992-06-09),
3. 5121177 - Silicon thin film transistor (1992-06-09),
4. 5114869 - Method for producing reverse staggered type silicon thin film transistor (1992-05-19),
5. 5111261 - Silicon thin film transistor with an intrinsic silicon active layer (1992-05-05),
6. 5109260 - Silicon thin film transistor and method for producing the same (1992-04-28),
7. 5071779 - Method for producing a silicon thin film transistor (1991-12-10),
8. 5053354 - Method of fabricating a reverse staggered type silicon thin film (1991-10-01),
9. 5021850 - Silicon thin film transistor (1991-06-04),
10. 4979006 - Reverse staggered type silicon thin film transistor (1990-12-18),
11. 4892613 - Process for etching light-shielding thin film (1990-01-09),

Title: **Katsuo Shirai: Innovator in Silicon Thin Film Transistors**

Introduction

Katsuo Shirai is a notable inventor located in Tochigi, Japan, recognized for his significant contributions to the field of semiconductor technology. With a portfolio of 11 patents, Shirai has been instrumental in advancing the design and functionality of silicon thin film transistors.

Latest Patents

One of Shirai's latest inventions is the silicon thin film transistor array, which features a multitude of silicon thin film transistors arranged in an array-like formation. Each transistor consists of a variety of intricate components, including an insulating substrate, gate electrode, gate insulating layer, and impurity-doped silicon layers, among others. This innovative design enables efficient connections between transistors through gate and source wiring, enhancing performance in electronic applications.

Career Highlights

Shirai's career has seen him working with several prominent companies, including Seikosha Co., Ltd. and Nippon Precision Circuits Inc. His experience at these organizations has facilitated his exploration and development of advanced semiconductor technologies, contributing to the evolution of electronic components.

Collaborations

Throughout his professional journey, Shirai has collaborated with notable colleagues, including Sakae Tanaka and Yoshiaki Watanabe. These partnerships have allowed for knowledge exchange and innovation, further driving advancements in the field of electronics.

Conclusion

Katsuo Shirai's work in the realm of silicon thin film transistors showcases his dedication to technological advancement and innovation. With 11 patents to his name, he continues to influence the electronics industry, paving the way for future developments in semiconductor technology.

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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