Patents by Inventor Tokuhito Shibata

Tokuhito Shibata 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).

  • Decorative precast concrete boards and process for producing the same
    Patent number: 4031684
    Abstract: Decorative precast concrete boards having a pore-free decorative porcelain-tile-like, hewn-stone-like or relief surface and a porous core layer are provided. Such precast concrete boards are produced by applying inorganic cement mortar containing siliceous volcanic sand called "shirasu" in a flat mold made of an elastomeric material so as to form the pore-free surface and pouring thereon an inorganic concrete mortar containing expanded particles of said siliceous sand as the aggregate. The concrete boards do not suffer efflorescence.
    Type: Grant
    Filed: November 11, 1975
    Date of Patent: June 28, 1977
    Inventor: Tokuhito Shibata