Patents by Inventor Kazumitsu Koboyashi

Kazumitsu Koboyashi 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).

  • Alcohol concentration sensor testing apparatus
    Patent number: 5205151
    Abstract: An apparatus for testing an alcohol concentration sensor used in measuring an alcohol concentration of a fluid containing alcohol. The alcohol concentration sensor includes a capacitive probe having a capacity dependent upon the alcohol concentration of the fluid, and a circuit sensitive to the capacity of the capacitive probe for producing an output signal indicative of a sensed alcohol concentration. The apparatus comprises a plurality of capacitors having different capacities each corresponding to a predetermined alcohol concentration. A selected one of the capacitors is connected in parallel with the capacitive probe. When the selected capacitor is connected with the capacitive probe, the output signal is read.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: April 27, 1993
    Assignee: Japan Electronic Control Systems Co., Ltd.
    Inventors: Masahiko Shimamura, Kazumitsu Koboyashi, Hideki Kamioka