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For the Inventor, By the Inventor

Yokohama, Japan

Eiji Tsumura

USPTO Granted Patents = 15

Average Co-Inventor Count = 3.5

ph-index = 6

Forward Citations = 82(Granted Patents)


Location History:

  • Yokohama, JP (2003 - 2017)
  • Osaka, JP (2024)

Company Filing History:

goldMedal15 out of 10,239 
 
Sumitomo Electric Industries, Limited
 patents
silverMedal2 out of 335 
 
Sumitomo Electric Device Innovations, Inc.
 patents
where one patent can have more than one assignee

Years Active: 2003-2025

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15 patents (USPTO):Explore Patents
1. 12429657 - Optical device and manufacturing method for optical device (2025-09-30),
2. 11901946 - Optical transmitter (2024-02-13),
3. 9766483 - Optical transceiver implementing erbium doped fiber amplifier (2017-09-19),
4. 9477051 - Optical transceiver having auxiliary area to install Mach-Zehnder modulator (2016-10-25),
5. 7463659 - Can-type optical transmitting module utilizing a laser diode with impedance matching resistors (2008-12-09),
6. 7317742 - Optical sub-assembly having a thermo-electric cooler and an optical transceiver using the optical sub-assembly (2008-01-08),
7. 7218657 - Optical transmitting module having a can type package and providing a temperature sensor therein (2007-05-15),
8. 7192201 - Optical transmitting module having a de-coupling inductor therein (2007-03-20),
9. 7026655 - Light-transmitting module containing an driving device in a package (2006-04-11),
10. 6994480 - Optical link module (2006-02-07),
11. 6976795 - Optical device and optical module (2005-12-20),
12. 6755577 - Optical module (2004-06-29),
13. 6652160 - Transmission optical module (2003-11-25),
14. 6600611 - Optical module (2003-07-29),
15. 6567441 - Source follower circuit, laser driving apparatus, semiconductor laser apparatus, current-voltage convertion circuit, and light receiving circuit (2003-05-20),

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.

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