Company Filing History:
3 out of 291 
2 out of 2,647 
1 out of 317 
Years Active: 2009-2018
Title: Shigehiro Umetsu: Innovator in Light-Emitting Devices
Introduction
Shigehiro Umetsu is a notable inventor based in Yonezawa, Japan. He has made significant contributions to the field of light-emitting devices, holding a total of 3 patents. His work focuses on improving the color-rendering properties of light emitted from these devices.
Latest Patents
One of his latest patents involves a light-emitting device that includes a first light-emitting region and a second light-emitting region. The first light-emitting region emits a light ray of a specific color by utilizing a first light-emitting layer group that consists of at least two different kinds of light-emitting layers. The second light-emitting region also emits a light ray of the same color, which can include daylight, natural white, warm white, or incandescent colors. Notably, at least one light-emitting layer in the second group emits light with a different spectrum peak than those in the first group. This innovation enhances the color-rendering properties of the emitted light.
Career Highlights
Shigehiro Umetsu has worked with prominent companies in the industry, including Tohoku Pioneer Corporation and Pioneer Corporation. His experience in these organizations has contributed to his expertise in developing advanced light-emitting technologies.
Collaborations
Some of his notable coworkers include Shuichi Seki and Hiroki Tan. Their collaboration has likely played a role in the development of innovative solutions in the field of light-emitting devices.
Conclusion
Shigehiro Umetsu's contributions to light-emitting devices demonstrate his commitment to innovation and improvement in technology. His patents reflect a deep understanding of the complexities involved in light emission and color rendering.