Patents by Inventor Max A. Threadgill

Max A. Threadgill 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).

  • Side pocket mandrel having forged indentations
    Patent number: 4759410
    Abstract: A side pocket mandrel for use in well tubing. The mandrel has a body, having an open bore extending through the body in alignment with the well tubing, and a side pocket offset from the bore. A valve receptacle is formed in the side pocket of the mandrel. The body of the mandrel has a plurality of forged indentations. These indentations are axially spaced above the valve receptacle and extend into the side pocket for a distance sufficient to keep well tools from entering the valve receptacle. The indentations may also taper away from the valve receptacle.
    Type: Grant
    Filed: September 5, 1986
    Date of Patent: July 26, 1988
    Assignee: Hughes Tool Company
    Inventors: Wilhelm E. Benker, James H. Holt, Jr., Max A. Threadgill