Patents Assigned to Hideo Sakai
  • Sound proof materials for buildings
    Patent number: 4237178
    Abstract: Sound proof materials for buildings are disclosed. This material is prepared by mixing powdery lead with an impregnating resin, a solvent, a plasticizer and the like and then applying them on at least one side of a glass cloth.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: December 2, 1980
    Assignee: Hideo Sakai
    Inventor: Tadashige Mazaki