Patents by Inventor Walter Wiederkehr

Walter Wiederkehr 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 for pulling a traction cable through an underground pipe
    Patent number: 6086050
    Abstract: A pulling apparatus includes a frame having a securing stirrup for securing a beam. The beam is provided at one end with a return pulley. Due to the structure of the securing stirrup, the tractive forces are transferred completely to the beam and the frame so that the means for securing the apparatus to the ground can be minimized. Such a design easily allows the beam to be set at an angle when the pipe is off center. The apparatus may also be easily placed in a cable chamber for operation.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: July 11, 2000
    Assignee: Plumettaz S.A.
    Inventors: Walter Wiederkehr, Gerard Plumettaz