Patents Assigned to Transcanada Pipelines Ltd.
  • Pipeline crawler
    Patent number: 4369713
    Abstract: A pipeline crawler comprises a wheeled power unit and a tractor unit having a plurality of driven wheels for engagement with the interior wall of a pipeline. A flexible power transmission extends from the power unit to the tractor unit for driving the driven wheels and includes a relational connection to permit rotary movement of the tractor unit relative to the power unit.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: January 25, 1983
    Assignee: Transcanada Pipelines Ltd.
    Inventor: Anthony C. Richardson