Patents Assigned to Gerhard Kopp GmbH
  • Plastic packing ring or disk and a method and apparatus for making same
    Patent number: 5271118
    Abstract: A plastic packing ring or disk for scrapers and other such bodies sliding in pipelines consists essentially of polyurethane and is supported annularly on the inside of the pipe. To make especially this kind of support elements on scrapers more resistant to friction stresses and improve their sliding qualities, the plastic packing rings or disks on the scrapers have embedded particles of solidified polyethylene at least in an outer part intended for contact with the pipeline.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: December 21, 1993
    Assignee: Gerhard Kopp GmbH
    Inventor: Juergen Piotrowitz