Patents by Inventor Tokihiro Tsuda

Tokihiro Tsuda 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).

  • Patent number: 5051023
    Abstract: The fracture-free paving block comprises a cement block substrate and a top solid layer, and is characterized in that the top layer is selected from a cured cement mortar layer and tile-like layer firmly bonded to the substrate with cement mortar; the top layer is bonded to the block substrate with lateral margins of 1 to 8 mm wide in horizontal distance from the peripheral edges of the substrate; and the vertical distance from the surface of the top layer to the peripheral edge of the substrate is 5 to 50 mm.
    Type: Grant
    Filed: January 3, 1991
    Date of Patent: September 24, 1991
    Assignees: Chichibu Cement Co., Ltd., Inax Corp., ILB Co., Ltd.
    Inventors: Kinoto Yoshida, Morizumi Fujii, Tokihiro Tsuda, Shigeo Suda, Osamu Kodama, Kazuro Kuroe, Takumi Tanikawa, Michihiko Nishimura, Hideyuki Munakata
  • Patent number: 4995932
    Abstract: The fracture-free paving block (1) comprises a cement block substrate (1-1) and a top solid layer (1-2), and is characterized in that the top layer is selected from a cured cement mortar layer and a tile-like layer firmly bonded to the substrate with cement mortar; the top layer is bonded to the block substrate with lateral margins (2) of 1 to 8 mm wide in horizontal distance (1.sub.5) from the peripheral edges of the substrate: and the vertical distance (1.sub.6) from the surface of the top layer to the peripheral edge of the substrate is 5 to 50 mm. The method for producing the paving block (1) having a tile-like top layer comprises applying adhesive cement mortar between the back of the top layer (1-2) and the upper surface of the substrate (1-1); placing the top layer on the substrate with the above-mentioned margins (2) of the substrate surface: and applying vibration and/or pressurization between the top layer and the substrate.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: February 26, 1991
    Assignees: Chichibu Cement Co., Ltd., Inax Corporation, ILB Co., Ltd.
    Inventors: Kinoto Yoshida, Morizumi Fujii, Tokihiro Tsuda, Shigeo Suda, Osamu Kodama, Kazuro Kuroe, Takumi Tanikawa, Michihiko Nishimura, Hideyuki Munakata