Patents by Inventor Ralph Sievering

Ralph Sievering 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: 5354529
    Abstract: A melt spinning apparatus adapted for spinning a plurality of preferably monofilaments each having a denier which is maintained within close tolerances. The apparatus comprises a nozzle head having a plurality of vertical bores which are annularly arranged about a central axis and a nozzle assembly in each of the bores. A separate melt delivery system delivers pressurized melt to each nozzle assembly, and in a preferred embodiment, each separate melt delivery system comprises one of the discharge outlets of a planetary gear pump.
    Type: Grant
    Filed: November 23, 1990
    Date of Patent: October 11, 1994
    Assignee: Barmag AG
    Inventors: Hans-Peter Berger, Ralph Sievering
  • Patent number: 5352106
    Abstract: A spinning apparatus for melt spinning thermoplastic multicomponent yarn is disclosed, in which a nozzle pack (22) is joined by bolts with a filter cup (13), with the entire unit being mounted by a thread (21) on a connecting plug (20) of the pump or distributor block (10). The nozzle pack (22) is adapted to produce bicomponent yarns, and the exchange of a single blending plate (37) allows the apparatus to produce different structures of bicomponent filaments. Such spinning apparatus enhance the flexibility of the synthetic fiber producer and reduce the cost for spare parts, since it is necessary to keep available only additional blending plates (37), but not entire nozzle packs (22).
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: October 4, 1994
    Assignee: Barmag AG
    Inventors: Erich Lenk, Ralph Sievering, Gerd Zimmerbeutel, Gerhard Nickisch