Company Filing History:
5 out of 42,496 
3 out of 836 
Years Active: 1978-1980
Title: Masao Sumi: Innovator in Optical Fiber Technology
Introduction
Masao Sumi is a prominent inventor based in Higashiyamato, Japan. He has made significant contributions to the field of optical fiber technology, holding a total of five patents. His work has been instrumental in advancing optical communication systems.
Latest Patents
Masao Sumi's latest patents include innovative designs for optical fibers. One of his notable inventions is a three-layer structure optical fiber. This optical fiber comprises a first transparent dielectric core layer with a relatively high refractive index, a second transparent dielectric intermediate layer with a relatively low refractive index, and a third transparent dielectric cladding layer with an intermediate refractive index. The parameters of this optical fiber are meticulously defined to optimize performance. Another significant patent is for an optical transmission line designed to enhance the product between transmission length and bandwidth. This design facilitates better connections between optical fibers, utilizing transparent materials arranged in concentric layers.
Career Highlights
Throughout his career, Masao Sumi has worked with esteemed companies such as Hitachi, Ltd. and Hitachi Cable, Inc. His experience in these organizations has allowed him to develop and refine his innovative ideas in optical technology.
Collaborations
Masao Sumi has collaborated with notable colleagues, including Seiichi Onoda and Toshiki P. Tanaka. These partnerships have contributed to the advancement of his research and inventions.
Conclusion
Masao Sumi's contributions to optical fiber technology have had a lasting impact on the field of optical communication. His innovative patents and collaborations highlight his role as a key figure in advancing this essential technology.