Patents by Inventor Hirro Hayashi

Hirro Hayashi 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).

  • Pencil sharpener
    Patent number: 4506716
    Abstract: A pencil sharpener comprises a tapered pencil-insertion cutting blade. The said blade and/or pencil-insertion bore is disposed so that a taper angle of said blade on the rear side of said sharpener with respect to an axis of a pencil may be smaller than a taper angle of said bore, and so that an end portion of said blade on the rear side of said sharpener may be sited at a distance from a cut surface of the pencil in a direction of the rear side of said sharpener.
    Type: Grant
    Filed: October 25, 1982
    Date of Patent: March 26, 1985
    Assignee: Yumi Tsukuni
    Inventor: Hirro Hayashi