Patents Assigned to Vera Fabrikker A/S
  • Pipes
    Patent number: 3967650
    Abstract: A pipe of fiber reinforced thermoplastic material is provided wherein the wall consists of at least one layer having two coaxial cylindrical shells between which a corrugated layer is disposed. The outwardly facing wave peaks of the corrugated layer are anchored to the inside of the outer shell and the inwardly facing wave peaks are anchored to the outside of the inner shell. The spaces between the corrugated layer and the outer layer and inner shell, respectively, are filled with a suitable material, preferably foam plastic material.
    Type: Grant
    Filed: November 29, 1973
    Date of Patent: July 6, 1976
    Assignee: Vera Fabrikker A/S
    Inventor: Kjell S. Borge