Patents by Inventor Friedhelm Hensen

Friedhelm Hensen 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).

  • Process for producing low shrinkage film bands
    Patent number: 4113935
    Abstract: A multistage stretching process for producing low shrinkage film bands of a thermoplastic polymer, especially polypropylene, wherein the stretching temperature is increased from one stage to the next under prescribed conditions for each stage and the stretched bands are then heat stabilized with shrinkage in a relaxed condition at a temperature of about 20.degree. C. to 30.degree. C. below the crystalline melting point of the polymer. The resulting film bands are especially useful in carpet backings.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: September 12, 1978
    Assignee: Barmag Barmer Maschinenfabrik AG
    Inventors: Heinz Schippers, Friedhelm Hensen, Gerhard Koslowski, Dieter Czerwon
  • Simultaneous production of plurality of filament winding packages
    Patent number: RE29959
    Abstract: Simultaneous production of a large number of winding packages of filaments of flat, round or profiled cross section by apparatus including extrusion devices, at least one cooling device, guide means, after-treatment devices (stretching, heating, etc.) and winding devices.
    Type: Grant
    Filed: April 29, 1974
    Date of Patent: April 10, 1979
    Assignee: Barmag Barmer Maschinenfabrik AG
    Inventors: Heinz Schippers, Friedhelm Hensen, Erich Lenk