Patents by Inventor Jack V. Christensen

Jack V. Christensen 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).

  • Vertical alignment tool for underground installation
    Patent number: 5799405
    Abstract: An aligning tool, involving plumb bob usage, for a fully assembled underground elevator ram system is provided and makes it possible to align the elevator ram into a required vertical position. Further this allows the fully assembled elevator to be vertically installed at site in a hole which often is flooded by groundwater.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: September 1, 1998
    Assignee: C.M.F. Corporation
    Inventors: Jack V. Christensen, Erwin D. Kanne
  • Underground containment for fluid systems
    Patent number: 5577862
    Abstract: A potentially economically viable apparatus is provided for the containment and detection of underground leaking fluids by employing a wrapper, often in the form of a conduit, to enclose the underground portion of a hydraulic fluid system. An important application is the detection and containment associated with an underground elevator system using hydraulic oil.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: November 26, 1996
    Assignee: C.M.F. Corporation
    Inventors: Jack V. Christensen, Ronald T. Bloomstran