Patents Assigned to Boa AG Luzern
  • Corrugated tubing
    Patent number: 3942702
    Abstract: A method of producing a corrugated flexible tube wherein a corrugated profiled strip having multiple corrugations is wound in a helical path such that its edges overlap and then the overlapped edges are tight welded together, preferably by electrical resistance welding, such that every welded corrugation of the resultant corrugated flexible tube is followed by at least one unwelded corrugation.
    Type: Grant
    Filed: March 29, 1974
    Date of Patent: March 9, 1976
    Assignee: Boa AG Luzern
    Inventor: Marco Dreyer