Patents Assigned to Hydrill Company
  • Free flow low energy pipe protector
    Patent number: 5542454
    Abstract: A pipe protector has been designed to provide free flow and low energy. The outside surface has a bilateral asymmetrical pattern when comparing the approximate top half of the pipe protector to the bottom half of the pipe protector. The pattern has raised figures surrounded by communicating channels.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: August 6, 1996
    Assignee: Hydrill Company
    Inventors: Douglas W. Carlson, Stephen P. Simons