Patents by Inventor James A. Imrie

James A. Imrie 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).

  • High and low voltage measuring apparatus employing a single display and impedance matching
    Patent number: 4204152
    Abstract: Apparatus for measuring a high voltage in an ignition circuit, in which voltage dividing means has a first arm for connection to a point of measurement in said circuit and a second arm connected to a rectifying means. The output of the rectifying means is connected to means for matching impedance at the rectifying means to a direct current voltage display means connected to the output of the impedance matching means such that a displayed voltage is related to the high voltage in the ignition circuit. Low voltage measuring circuitry is also present which is connectable directly to the display means without the use of an impedance matching circuit.
    Type: Grant
    Filed: July 5, 1978
    Date of Patent: May 20, 1980
    Inventor: James A. Imrie