This inventor holds 1 USPTO granted patent. Top assignees: Hakko Co., Ltd., Tokyo Gas Company Limited. Active years: 1985.
Company Filing History:
1 out of 15 
1 out of 193 
Years Active: 1985
Title: Hisao Ootsuga: Innovator in Underground Pipe Repair
Introduction
Hisao Ootsuga is a notable inventor based in Yokohama, Japan. He is recognized for his innovative contributions to the field of underground pipe repair. His work has significantly impacted the methods used to maintain essential infrastructure.
Latest Patents
Ootsuga holds a patent for a method of repairing pipes laid underground. This method specifically addresses the repair of gas pipes, which consist of a main supply pipe with numerous distribution pipes branching off to individual users. The innovative approach utilizes resin to repair both the main supply pipe and the distribution pipes from within while they remain buried. A key feature of this invention is the ability to confirm the integrity of the repairs through sealage tests conducted on both the main supply pipe and the distribution pipes upon completion of the repair process. He has 1 patent to his name.
Career Highlights
Throughout his career, Ootsuga has worked with prominent companies such as Hakko Co., Ltd. and Tokyo Gas Company Limited. His experience in these organizations has contributed to his expertise in the field of pipe repair technology.
Collaborations
Ootsuga has collaborated with notable colleagues, including Isao Saito and Motoyuki Koga. Their combined efforts have further advanced the innovations in underground pipe repair.
Conclusion
Hisao Ootsuga's contributions to the field of underground pipe repair demonstrate his commitment to innovation and infrastructure maintenance. His patented method showcases the importance of effective repair techniques in ensuring the safety and reliability of essential services.