Patents by Inventor Yasukazu Kawamura

Yasukazu Kawamura 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).

  • Liquid crystal display unit
    Patent number: 4945350
    Abstract: A liquid crystal display unit comprising a liquid crystal display panel and a light source for illuminating the display panel with uniform brightness sufficient for identifying characters and images in a dark or dim place. The light source may be a combination of at least one fluorescent lamp and a light-guiding member, a single meandering fluorescent lamp, or a single fluorescent lamp having a zigzag discharge path. Thermal-pressure-welding type flexible cables connect the display panel with an electric driving circuit therefor. A light source having more thickness than five millimeters is incorporated with the liquid crystal display unit.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: July 31, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Yasukazu Kawamura
  • Quartz crystal vibrator with partial electrodes for harmonic suppression
    Patent number: 3946257
    Abstract: It is disclosed a quartz crystal vibrator for a timepiece having a partial electrode which is able to offset the charge produced by higher harmonic oscillation.According to this invention, higher harmonic oscillation is prevented and vibrators oscillate by only fundamental frequency.
    Type: Grant
    Filed: September 11, 1974
    Date of Patent: March 23, 1976
    Assignee: Kabushiki Kaisha Daini Seikosha
    Inventor: Yasukazu Kawamura