Location History:
- Yono, JP (1988)
- Omiya, JP (1993 - 1995)
- Tokyo, JP (1996)
Company Filing History:
5 out of 775 
1 out of 2,861 
Years Active: 1988-1996
Title: Shigeo Yamamura: Innovator in Organic Electroluminescent Devices and Toners
Introduction
Shigeo Yamamura is a notable inventor based in Omiya, Japan. He has made significant contributions to the fields of organic electroluminescent devices and electrophotographic toners. With a total of 5 patents to his name, his work has had a considerable impact on technology and materials science.
Latest Patents
One of his latest patents is for an organic electroluminescent device. This device comprises an anode, a positive-hole transport layer, an emitting layer, an electron transport layer, and a cathode, all layered in sequence. The emitting layer and/or the electron transport layer includes at least one of dioxazine compounds or diazine compounds. This innovation improves the emitting capability of the device in terms of luminance and efficiency when a low voltage is applied.
Another significant patent is for an electrophotographic toner. This toner contains a specific compound as the charge control agent, which results in a sharper distribution of electrification and enhanced moisture resistance and time stability compared to conventional toners. This advancement allows for the production of images with very high gradation and the capability of repeatedly forming images. The colorless nature of the charge control agent also allows for flexible selection of colorants without affecting the inherent hue of dyes and pigments.
Career Highlights
Shigeo Yamamura has worked with prominent companies such as Nippon Kayaku and Pioneer Electronic Corporation. His experience in these organizations has contributed to his expertise and innovative capabilities in the field.
Collaborations
Some of his notable coworkers include Tadayuki Kiyoyanagi and Junko Yamamoto. Their collaborative efforts have likely played a role in advancing the projects they have worked on together.
Conclusion
Shigeo Yamamura's contributions to organic electroluminescent devices and electrophotographic toners highlight his innovative spirit and technical expertise. His patents reflect a commitment to improving technology and materials, making him a significant figure in his field.