Patents by Inventor Yoshimasa Yokoyama

Yoshimasa Yokoyama 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: 4669986
    Abstract: A writing training device is disclosed, which comprises a base board with a surface having flexibility to such an extent as to be able to absorb the writing pressure to a certain extent and provided with letters, numerals, drawings, pictures or the like represented by grooves capable of receiving the tip of a pencil or like writing tool.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: June 2, 1987
    Inventor: Yoshimasa Yokoyama
  • Patent number: 4126958
    Abstract: The present invention provides a fumigator for mosquito coil adapted for use in suspension or by placement on a table, composed of a circular body and a similar shaped lid which can be coupled and separated, as desired, at their peripheral portions or rims with nets spread over the contacting edge surfaces thereof respectively, so that they can be formed, when coupled together, into a receptacle carrying the nets inside to hold an ignited mosquito coil therebetween.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: November 28, 1978
    Inventor: Yoshimasa Yokoyama