Patents by Inventor Thomas E. Schwager

Thomas E. Schwager 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).

  • Apparatus and method for connecting a tubing string to downhole well equipment
    Patent number: 4067385
    Abstract: Apparatus is disclosed for tieing at least one tubing string suspended in a well pipe from a subsea non-rotatable christmas tree located on the sea floor to a downhole hanger affixed to the well pipe. The tubing string has a tie-back tool arranged on its lower end which contains first orienting means. The hanger contains second orienting means which is engageable with the first orienting means to position the tie-back tool in a desired angular position. Means arranged on the tubing string permit the tie-back tool to rotate to such angular position without placing torsional load on the tubing string. The method in which the tubing string is tied to the hanger is also disclosed.
    Type: Grant
    Filed: September 29, 1976
    Date of Patent: January 10, 1978
    Assignee: Exxon Production Research Company
    Inventors: Thomas E. Schwager, Joseph A. Burkhardt