Patents by Inventor Frank T. Kühn

Frank T. Kühn 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).

  • Patent number: 6562940
    Abstract: The invention relates to a granule and granulate and to a process for the preparation of polyamide granules at least comprising a) polymerizing at least one dicarboxylic acid and at least one diamine until a low-molecular prepolymer powder is obtained; b) processing the prepolymer powder obtained in step (a) to form granules, with the prepolymer powder being extruded at a temperature, measured under the chosen extrusion conditions, below the melting point of the prepolymer. The process of the invention allows the production of granules that have a higher granule strength than that according to the state of the art. The process of the invention also produces fewer fines. It is preferred for polyamide-4,6 to be chosen as polyamide. The granules and the granulate obtained by the process of the invention are particularly suited for post-condensation.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: May 13, 2003
    Assignee: DSM N.V.
    Inventors: Frank T. Kühn, Rudy Rulkens