This inventor holds 4 USPTO granted patents, plus 1 CIPO patent. Top assignees: W. R. Grace Co.-Conn., Aiko Engineering Co., Ltd., Other. Active years: 1984-2004.
Company Filing History:
2 out of 1,391 
1 out of 3 
1 out of 834,411 Years Active: 1984-2004
Title: Sachio Shimizu: Innovator in Tunnel Waterproofing Technologies
Introduction
Sachio Shimizu is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of tunnel waterproofing, holding a total of 4 patents. His innovative methods have improved the efficiency and effectiveness of waterproofing in tunnel construction.
Latest Patents
Shimizu's latest patents include a tunnel waterproofing method that involves spraying a primary coating of concrete onto the excavation surface of a tunnel. This method also includes the installation of a waterproofing sheet with an adhesive layer that bonds with the concrete. Additionally, a secondary coating of concrete is sprayed against the adhesive side of the waterproofing sheet. A buffer water conducting sheet is preferably established between the primary concrete coating and the waterproofing sheet. Another significant patent is a tunnel waterproofing construction method that avoids dripping and fogging during spray application. This method eliminates the use of organic solvents and unpleasant odors while providing superior waterproofing characteristics and economic advantages. It involves spraying a primary spray cement concrete onto the excavated tunnel surface, followed by the application of an ambient-temperature vulcanization-type rubber emulsion to form a rubber film. A secondary concrete coating is then established on the rubber surface.
Career Highlights
Throughout his career, Sachio Shimizu has worked with various companies, including W. R. Grace Co. in Connecticut. His work has focused on enhancing tunnel construction techniques, particularly in waterproofing applications.
Collaborations
Shimizu has collaborated with notable professionals in his field, including Keiichi Kosuge. Their joint efforts have contributed to advancements in tunnel waterproofing technologies.
Conclusion
Sachio Shimizu's innovative approaches to tunnel waterproofing have made a significant impact in the construction industry. His patents reflect a commitment to improving safety and efficiency in tunnel construction.