Patents by Inventor David Walter Judd

David Walter Judd 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).

  • Direct readout distance measuring device
    Patent number: 3973326
    Abstract: A device for measuring distances is provided wherein, after calibration of the device, a cursor mounted on an elongate movable wand is moved to the point whose distance from a datum point is to be determined. A resistor extends along the length of the wand and an electrical contact on the cursor makes point contact with the resistor. The contact and resistor form a potentiometer whose output varies directly with the position of the cursor. A digital voltmeter connected to the output of the potentiometer provides an indication of the distance measured.
    Type: Grant
    Filed: August 7, 1974
    Date of Patent: August 10, 1976
    Inventors: John David Gallacher, Johann Leopold Nevrkla, David Walter Judd