Location History:
- Yamato, JP (1985)
- Kanagawa, JP (1988 - 2013)
Company Filing History:
2 out of 36 
2 out of 5 
2 out of 354 
Years Active: 1985-2013
Title: Hiroyuki Yamakawa: Innovator in Water Vapor Measurement and Underwater Composition
Introduction
Hiroyuki Yamakawa is a notable inventor based in Kanagawa, Japan. He has made significant contributions to the field of measurement technology and material science, holding a total of three patents. His work focuses on enhancing the accuracy and efficiency of measuring water vapor permeability and developing concrete compositions for underwater applications.
Latest Patents
One of Yamakawa's latest patents is an "Apparatus and method for measurement of water vapor permeability." The objective of this invention is to provide a method and apparatus that can measure the quantities of water vapor passing through a measured object with high sensitivity and in a short time period. This apparatus measures water vapor permeability based on a dew point temperature in a second space, which is measured after introducing water vapor into a first space. The first space is maintained at a predetermined temperature and humidity under atmospheric pressure, while the second space is kept dry with a dew point temperature of -70°C or less under atmospheric pressure.
Another significant patent by Yamakawa is related to "Concrete composition for underwater use." This invention aims to improve the performance and durability of concrete when used in underwater environments, addressing challenges faced in construction and engineering.
Career Highlights
Throughout his career, Hiroyuki Yamakawa has worked with prominent companies, including Takenaka Komuten Co., Ltd. and Takenaka Doboku Co., Ltd. His experience in these organizations has allowed him to develop innovative solutions that address real-world challenges in construction and material science.
Collaborations
Yamakawa has collaborated with notable colleagues, including Koichi Ito and Masaharu Sakuta. These partnerships have contributed to the advancement of his inventions and the successful implementation of his patented technologies.
Conclusion
Hiroyuki Yamakawa is a distinguished inventor whose work in water vapor measurement and underwater concrete composition has made a significant impact in his field. His innovative patents reflect his commitment to advancing technology and improving material performance.