Patents by Inventor Ludwig Hartman

Ludwig Hartman 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).

  • Spun-bonded fabric of partially drawn polypropylene with a low draping coefficient
    Patent number: 4434204
    Abstract: The present invention provides for a soft, polypropylene spun-bonded fabric comprising continuous, i.e. endlessly spun, partially drawn polypropylene filaments which have a maximum tensile elongation of at least 200%.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: February 28, 1984
    Assignee: Firma Carl Freudenberg
    Inventors: Ludwig Hartman, Ivo Ruzek, Engelbert L/o/ cher