Patents by Inventor Hartmut Kratzke

Hartmut Kratzke 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).

  • Method for making polyamide fibers
    Patent number: 6719937
    Abstract: The invention relates to a process for manufacturing polyamide fibers having properties suitable and compatible for use as fibers for the manufacture of felt for paper machines. The process of the invention relates more particularly to the addition of stabilizers to the polyamide in order to obtain polyamide fibers having high properties, especially high resistance to light, heat and aggressive environments. The process of the invention consists in adding the stabilizer directly to the polyamide, without producing a preblend, and then in mixing the polyamide with the additive in an extruder for feeding the composition into a die for obtaining filaments.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: April 13, 2004
    Assignee: Rhodia Performance Fibres
    Inventors: Hartmut Kratzke, Jürgen Lasch