Patents by Inventor Toshio Hatsuzaki

Toshio Hatsuzaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of sealing water leakage in concrete structures
    Patent number: 4744193
    Abstract: A mixture consisting essentially of (1) an organic polyisocyanate compound and/or a prepolymer having terminal isocyanate residues, which is derived from the reaction of an organic polyisocyanate with a polyhydroxyl compound, and (2) 2-pyrrolidone, is injected for grouting into water-leaking cracks or openings of concrete structures such as water tanks, subway constructions and tunnels. The injected mixture diffuses into the cracks or openings and is cured in short time by reacting with water at the leaking sites. The resultant polyurethane foam securely seals the water leaking sites.
    Type: Grant
    Filed: November 6, 1986
    Date of Patent: May 17, 1988
    Assignees: Taisei Corporation, Nisshinboseki Kabushiki Kaisha
    Inventors: Toshio Hatsuzaki, Yoshihiko Ogawa, Toshio Hiramatsu, Hideo Senga, Takehiko Tokoro