Patents by Inventor Ludwig Hartmann

Ludwig Hartmann 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).

  • Spunbonded fabrics of nylon-6 filaments
    Patent number: 3991250
    Abstract: A spunbonded fabric of nylon 6, bonded by binders such as polyacrylates and polyurethanes, in which the filaments are substantially in the .gamma.-modification in the crystalline regions and the average molecular orientation, produced by attenuation, of the nylon 6 filaments is at most 80% of the theoretically possible orientation. It is an object of the invention to produce spunbonded fabrics of improved properties and to do so more economically, e.g. with higher outputs.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: November 9, 1976
    Assignee: Lutravil Spinnvlies GmbH & Co.
    Inventors: Ludwig Hartmann, Lueder Gerking, Gerhard Mueller
  • Dimensionally stable, high-tenacity non-woven webs and process
    Patent number: 3975224
    Abstract: Dimensionally stable, high-tenacity non-woven webs and process for their manufacture. The non-woven webs of the invention are distinguished by a relative grab-tensile strength of at least 200 p/g/m.sup.2, a breaking extension of not more than 50% and a shrinkage of not more than 1%, as measured at 160.degree.C, and are primarily useful as reinforceing and backing materials in the manufacture of needle-punched and tufted carpets.
    Type: Grant
    Filed: August 16, 1973
    Date of Patent: August 17, 1976
    Assignee: Lutravil Spinnvlies GmbH & Co.
    Inventors: Ivo Ruzek, Guenther Worf, Ludwig Hartmann, Paul Maahs, Lueder Gerking