Patents by Inventor John Harrel

John Harrel 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).

  • Device for positioning and stabbing casing from a remote selectively variable location
    Patent number: 5062756
    Abstract: A casing stabbing apparatus which includes a derrick bracket subassembly for attachment to a derrick, and a boom having an end pivotally connected to the bracket assembly for pivotation about a vertical axis and about a horizontal axis. A pair of arcuate casing gripping jaws is pivotally connected to the second end of the boom. A piston and cylinder assembly extends between the jaws to selectively converge and diverge the jaws. A second piston and cylinder assembly extends between the bracket assembly and the boom to elevate the boom by pivotation about a horizontal pivotal axis. A third piston and cylinder assembly extends between the bracket assembly and the boom to swing the boom laterally in pivotation about a vertical axis.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: November 5, 1991
    Assignees: John Harrel, Charlena Harrel
    Inventors: James R. McArthur, John Harrel, John Mayberry