Patents by Inventor Thomas J. Barlo

Thomas J. Barlo 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).

  • Method and apparatus for measuring the polarized potential of a buried or submerged structure protected by impressed current
    Patent number: 4591792
    Abstract: The polarized potential at the boundary between a submerged pipe and a medium is measured unaffected by the presence of a distributed IR drop in the medium due to an impressed current from a corrosion protection system. The voltage between the pipe and a reference electrode in the medium is measured when the protection system current is zero. This is accomplished with a sample-and-hold circuit controlled by a trigger signal derived from the input signal and having a variable phase for controlling the phase angle at which the sample is taken.
    Type: Grant
    Filed: February 8, 1984
    Date of Patent: May 27, 1986
    Assignee: Gas Research Institute
    Inventors: John R. Birchmeier, George T. Ruck, Neil G. Thompson, Thomas J. Barlo