Patents by Inventor Allan Hamberg

Allan Hamberg 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 well casing inspection
    Patent number: 4804906
    Abstract: An oil and gas well casing inspection tool is disclosed. The casing inspection tool comprises a body; inner and outer contact rollers extending from the body; means for generating a current between the outer contacts; and means for measuring a potential difference between the inner contacts. To enhance the accuracy of the device, capacitance is used downhole to increase the amount of current that can be supplied to the casing. Leaf springs engage the contact rollers to maintain a clean connection between the body and the casing. Signal coders and decoders are also disclosed.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: February 14, 1989
    Assignee: Chevron Research Company
    Inventors: Allan Hamberg, Elmer L. Thomas, Henry T. Carruth, Jr., Mitchell F. Peterson