Patents by Inventor Glenn S. Hartong

Glenn S. Hartong 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).

  • Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipeline
    Patent number: 5126654
    Abstract: Electrical current distribution in the soil surrounding a buried pipeline is detected by applying an AC electrical potential between the pipe and a buried electrode spaced from the pipe. The magnetic field at spaced localities along the pipe arising from currents transverse to the pipe is detected. Additionally, a potential containing a plurality of alternating frequencies is similarly applied to the pipe and the magnetic field induced by the resulting electrical current both along the pipe and transversely of the pipe is detected. The magnetic field is detected by correlation discrimination at spaced locations along the pipe and across the spectrum of the impressed frequencies. The detected data is used to determine the capacitance and resistance of the soil/pipe interface at localities along the pipe and to generate impedance plots which indicate characteristics of that interface.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: June 30, 1992
    Assignees: New York Gas Group, Southern California Gas Company,, Columbia Gas System Service Corporation
    Inventors: John C. Murphy, Glenn S. Hartong, Ralph F. Cohn, Patrick J. Moran
  • Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipeline
    Patent number: 5087873
    Abstract: Electrical current distribution in the soil surrounding a buried pipeline is detected by applying an AC electrical potential between the pipe and a buried electrode spaced from the pipe. The magnetic field at spaced localities along the pipe arising from currents transverse to the pipe is detected. Additionally, a potential containing a plurality of alternating frequencies is similarly applied to the pipe and the magnetic field induced by the resulting electrical current both along the pipe and transversely of the pipe is detected. The magnetic field is detected by correlation discrimination at spaced locations along the pipe and across the spectrum of the impressed frequencies. The detected data is used to determine the capacitance and resistance of the soil/pipe interface at localities along the pipe and to generate impedance plots which indicate characteristics of that interface.
    Type: Grant
    Filed: April 24, 1991
    Date of Patent: February 11, 1992
    Assignees: New York Gas Group, Southern California Gas Company, Columbia Gas System Service Corporation
    Inventors: John C. Murphy, Glenn S. Hartong, Ralph F. Cohn, Patrick J. Moran