Patents by Inventor Masaji Yonekawa

Masaji Yonekawa 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).

  • Viewing window for electronic wristwatches employing light emitting diode display
    Patent number: 4086754
    Abstract: In electronic wristwatches employing an array of light emitting diodes (LED) as digital display, an ornamental coating is provided over the rear surface of a front glass sheet except the viewing window region thereof through the use of painting, printing, etc., while a color filter corresponding to the color of the light emitting display is provided at least over the viewing window region. With such an arrangement, the visibility is enhanced with a simplified construction.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: May 2, 1978
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masaji Yonekawa, Takehiko Sasaki
  • Switching assembly in combination wristwatch and calculator
    Patent number: 4055755
    Abstract: In a combination wristwatch and calculator, a key input means for information entry employs a touch sensitive electronic switching circuitry comprising a C-MOS inverter. One electrode for the touch sensitive electronic switching circuitry is provided on the front panel of the combination wristwatch and calculator, whereas another electrode for the touch sensitive electronic switching circuitry is positioned on the rear surface of the combination wristwatch and calculator. The present key input means is equally applicable to a miniature electronic calculator.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: October 25, 1977
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tutomu Nakamura, Takehiko Sasaki, Masaji Yonekawa, Hidetoshi Maeda