Company Filing History:
3 out of 522 
1 out of 5,290 
1 out of 377 
Years Active: 1985-1989
Title: The Innovations of Shinzo Yamakawa
Introduction
Shinzo Yamakawa is a notable inventor based in Katsuta, Japan. He has made significant contributions to the field of optical fiber technology, holding a total of 4 patents. His work focuses on enhancing the performance and durability of optical fibers through innovative materials and processes.
Latest Patents
Yamakawa's latest patents include a coated optical fiber and its fabrication process. This invention features a coated optical fiber that comprises an optical fiber surrounded by a first layer of thermoplastic rubber composition. This first layer has a Young's modulus of 0.1 GPa or less and is capable of extrusion coating. Additionally, a second layer of thermoplastic resin composition is applied, which has a linear expansion coefficient of 1.times.10.sup.-5.degree. C..sup.-1 or less and a Young's modulus of 5 GPa or more. This innovative design allows the coated optical fiber to maintain excellent transmission characteristics at both low and high temperatures while being cost-effective. Another significant patent involves a UV-ray curable polyurethane composition, which includes a polyurethane derived from a polyether polyol and a diene polymer with a hydroxyl group. This composition exhibits good coating characteristics and results in a coated optical fiber that has low transmission loss over a wide temperature range and high strength even in water.
Career Highlights
Throughout his career, Shinzo Yamakawa has worked with prominent organizations, including Nippon Telegraph and Telephone Public Corporation and Nippon Telegraph and Telephone Corporation. His experience in these companies has allowed him to develop and refine his innovative ideas in optical fiber technology.
Collaborations
Yamakawa has collaborated with notable colleagues such as Takao Kimura and Norio Murata. Their combined expertise has contributed to the advancement of optical fiber technologies.
Conclusion
Shinzo Yamakawa's contributions to the field of optical fiber technology are significant and impactful. His innovative patents demonstrate a commitment to improving the performance and reliability of optical fibers. His work continues to influence the industry and pave the way for future advancements.