Patents by Inventor Paul D. Knudsen

Paul D. Knudsen 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).

  • Patent number: 5433680
    Abstract: An elliptical path pedaling system uses two mutually perpendicular intersecting guideways with a circular drive member pivotally attached at its center to a follower, mounted for reciprocal movement within the first guideway. A second follower is pivotally attached to the circular drive member at a predetermined radial distance from the center of said drive member for reciprocal movement in the second guideway. A pedal crank is attached to the drive member to rotate it about the center. As the drive member rotates, the reciprocating movements of the two followers in the perpendicular guideways cause the drive member to move back and forth in the path of the first guideway. A pedal crank attached to the reciprocating drive member follows an elliptical path. A chain or other suitable drive transfer device is coupled between the drive member and a circular driven member, which is rotated about its center and is mounted in a fixed position relative to the guideways.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: July 18, 1995
    Inventor: Paul D. Knudsen
  • Patent number: D307083
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: April 10, 1990
    Inventor: Paul D. Knudsen