Patents by Inventor William D. Balkman

William D. Balkman 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).

  • Patent number: 7295654
    Abstract: A digital kick meter measures capacitive kick between two conductors and ground of a cable. The digital kick meter includes a resistance measuring circuit connectable to two of the conductors to provide a signal indicative of a capacitance between the two conductors. A filter is coupled to the resistance measuring circuit to filter a signal provided by the resistance measuring circuit, thereby producing a kick signal. Processing circuitry is coupled to the filter, and a graphical user interface (GUI) is coupled to the processing circuitry to display data related to the kick signal. The GUI may include an active bar graph dynamically displaying the kick signal on a graduated scale and retaining a peak value of the kick signal on the graduated scale.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: November 13, 2007
    Assignee: 3M Innovative Properties Company
    Inventor: William D. Balkman
  • Patent number: 5093622
    Abstract: An apparatus for determining the direction to and position of a buried conductor carrying an AC signal. The apparatus employs a unique antenna unit having upper and lower sensors, each sensor having two orthogonal solenoid coils. The signals from these coils, which are representative of the magnetic flux therethrough, are processed to yield corresponding digital values. The numbers are combined in a novel formula to yield a value which has been empirically found to be indicative of lateral postion. An appropriate display is controlled by the microprocessor according to the sign and magnitude of the positional value.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: March 3, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: William D. Balkman