Patents Assigned to Dainabot Company, Limited
  • Electrode-separated piezoelectric crystal oscillator and method for measurement using the electrode-separated piezoelectric crystal oscillator
    Patent number: 5235238
    Abstract: Herein disclosed is a device for determining the concentration of a substance in a solution by making use of a quartz oscillator. In the device, at least one of a plurality of electrodes for applying an electrical voltage to a crystal wafer is separated from the crystal wafer, and the space between the separated electrode and the crystal wafer is filled with a conductive substance. The electrode-separated piezoelectric crystal oscillator thus obtained can be made more highly accurate, smaller-sized and more inexpensive.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: August 10, 1993
    Assignee: Dainabot Company, Limited
    Inventors: Toshiaki Nomura, Tohru Yamada