Patents by Inventor Carl E. Christensen

Carl E. 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).

  • Trailer cover lift arm
    Patent number: 5681074
    Abstract: A trailer cover lift arm for assisting in opening a trailer cover and supporting the cover in an open position. The lift arm can include four elongate members each member having two ends pivotably coupled to define a member having parallelogram-like shape. First and second elongated gas springs can be disposed within the parallelogram member to assist an operator in opening, and supporting a trailer cover in an open position. The lift arm can be used to two-way tilt open a trailer cover.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: October 28, 1997
    Inventor: Carl E. Christensen
  • Trailer cover
    Patent number: D367248
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: February 20, 1996
    Inventor: Carl E. Christensen