Patents by Inventor Tetsuzo Maruyama

Tetsuzo Maruyama 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).

  • Injection skis and their process of manufacture
    Patent number: 4725070
    Abstract: Ski upper- and lower-surface constituting materials are set in position in a mold provided with a space appropriate for the dimensional distribution of the padding for the ski. The ski upper-surface constituting material is arranged so that a resin sheet of ABS resin, etc. constitutes the outer surface of ski. The inner upper surface of the upper mold piece is formed in a curved surface having, for example, grooves. A foamy resin is injected to fill the space between the ski upper and lower constituting materials. The foaming pressure raised by the foamy resin will press the resin sheet against the inner upper surface of the upper mold piece with resulting deformation of the resin sheet. Thus one may obtain a ski which is provided on its upper surface with projections.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: February 16, 1988
    Assignee: Kabushiki Kaisha Swallow Ski
    Inventor: Tetsuzo Maruyama
  • Injection skis and their process of manufacture
    Patent number: 4681725
    Abstract: Ski upper- and lower-surface constituting materials are set in position in a mold provided with a space appropriate for the dimensional distribution of the padding for the ski. The ski upper-surface constituting material is arranged so that a resin sheet of ABS resin, etc. constitutes the outer surface of ski. The inner upper surface of the upper mold piece is formed in a curved surface having, for example, grooves. A foamy resin is injected to fill the space between the ski upper and lower constituting materials. The foaming pressure raised by the foamy resin will press the resin sheet against the inner upper surface of the upper mold piece with resulting deformation of the resin sheet. Thus one may obtain a ski which is provided on its upper surface with projections.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: July 21, 1987
    Assignee: Kabushiki Kaisha Swallow Ski
    Inventor: Tetsuzo Maruyama