Patents by Inventor Jan Rydberg

Jan Rydberg 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).

  • Apparatus and a method for the extrusion of moulding from a cross-linkable polymer material
    Patent number: 6524516
    Abstract: The present invention relates to apparatus for extruding mouldings from cross-linkable polymer material. The apparatus includes a first part to which the polymer material is delivered from a material container, and a second part which forms a moulding tool for moulding and cross-linking said article. The first part of the apparatus includes a feed zone (2) that has an inlet (8), a generally tubular outlet (7) and a rotatable feed screw (10) that functions to compress and feed the polymer material in a unmelted or solid state from said inlet (8) to said outlet (7), wherein the length of the feed screw (10) does not exceed the length of the feed zone (2).
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: February 25, 2003
    Assignee: Wirsbo Burks AB
    Inventors: Jan Rydberg, Nils-Olof Johnsson, Curt Axelsson, Michael Sjöberg
  • Method for heating and/or cross-linking of polymers and apparatus therefor
    Patent number: 6106761
    Abstract: The invention relates to a process for heating polymer material, including irradiation of said polymer material with infrared radiation. In accordance with the process according to the invention the infrared radiation has wave lengths which substantially are not equal to the absorption peaks of the polymer material in respect of infrared radiation.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: August 22, 2000
    Assignee: Wirsbo Bruks AB
    Inventors: Michael Sjoberg, Jan Rydberg, Jyri Jarvenkyla