This inventor holds 15 USPTO granted patents. Top assignees: Sumitomo Electric Industries, Limited, Sumitomo Electric Device Innovations, Inc.. Active years: 2003-2025.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Location History:
- Yokohama, JP (2003 - 2017)
- Osaka, JP (2024)
Company Filing History:

Years Active: 2003-2025
Title: Eiji Tsumura: Innovator in Optical Devices
Introduction
Eiji Tsumura is a prominent inventor based in Yokohama, Japan, known for his significant contributions to the field of optical devices. With a total of 15 patents to his name, Tsumura has made remarkable advancements that enhance the functionality and efficiency of optical technologies.
Latest Patents
Among his latest innovations, Tsumura has developed an optical device that includes a light-emitting element, first and second lenses, and an optical component that multiplexes input lights. This device is designed to improve the performance of optical systems. Additionally, he has created an optical transmitter that features a housing with an emission end, a light-emitting element, and a light-receiving element. This transmitter is engineered to monitor output light effectively, utilizing materials with different coefficients of thermal expansion to optimize performance.
Career Highlights
Eiji Tsumura has worked with notable companies such as Sumitomo Electric Industries, Limited and Sumitomo Electric Device Innovations, Inc. His experience in these organizations has allowed him to refine his skills and contribute to cutting-edge optical technologies.
Collaborations
Throughout his career, Tsumura has collaborated with esteemed colleagues, including Kazushige Oki and Hisao Go. These partnerships have fostered innovation and have been instrumental in the development of his patented technologies.
Conclusion
Eiji Tsumura's work in optical devices showcases his dedication to innovation and his ability to push the boundaries of technology. His contributions have significantly impacted the field, and his patents reflect a commitment to advancing optical solutions.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile