Patents Assigned to Uponor AB
  • Method and apparatus for continuously extruding single-wall pipe of plastics or other mouldable material
    Patent number: 4710337
    Abstract: The invention refers to a method and apparatus for manufacturing a single-wall pipe, tube or like conduit (9,44) having smooth inner surfaces and a mechanical-strength enhancing pattern of walls, flanges or ridges on the outer surface thereof, the conduit being made of plastics or like extrudable material.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: December 1, 1987
    Assignee: Uponor AB
    Inventor: Erik G. W. Nordstrom