Patents by Inventor Lars Höjer

Lars Höjer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Use of cross-linked polyolefins material in pressure pipes
    Patent number: 6325959
    Abstract: Use of at least partly cross-linked polyolefin plastic, which is oriented biaxially, as material for pressure pipes, is described. The pressure pipe is produced by extrusion with subsequent axial and peripheral orientation of the pipe, the pipe being at least partly cross-linked before the biaxial orientation. Preferably, the pipe is cross-linked to about 20-50% before orientation. By the at least partial cross-linking before orientation, this can be carried out at temperatures above the crystalline melting point of the plastic material.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: December 4, 2001
    Assignee: Borealis A/S
    Inventors: Carl-Gustaf Ek, Lars Höjer