Patents by Inventor Rudiger Dollhopf

Rudiger Dollhopf 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).

  • Publication number: 20050126582
    Abstract: Abstract of the Disclosure The invention relates to a filter tow made from crimped endless cellulose acetate filaments, whereby the filaments form at least two connected fibre bundles with the same filament titre of at least 600 filaments. The filament titres differ from bundle to bundle by at least 1 dtex Furthermore a filter tow is disclosed with a crimp ratio of more than 40%, said filaments comprising at least 22 crimp turns per filament length.
    Type: Application
    Filed: May 4, 2004
    Publication date: June 16, 2005
    Applicant: Rhodia Acetow GmbH
    Inventors: Rudiger Dollhopf, Eberhard Teufel, Thomas Leutner, Dieter Kuner, Christian Vogt
  • Publication number: 20040237982
    Abstract: The invention relates to a filter tow made from crimped endless cellulose acetate filaments, whereby the filaments form at least two connected fibre bundles with the same filament titre of at least 600 filaments. The filament titres differ from bundle to bundle by at least 1 dtex Furthermore a filter tow is disclosed with a crimp ratio of more than 40%, said filaments comprising at least 22 crimp turns per filament length.
    Type: Application
    Filed: May 4, 2004
    Publication date: December 2, 2004
    Inventors: Rudiger Dollhopf, Eberhard Teufel, Thomas Leutner, Dieter Kuner, Christian Vogt
  • Patent number: 5860201
    Abstract: An apparatus for the production of a multiple width fiber strip consisting of crimped interlaced filaments and having several zones extending in longitudinal direction of the fiber strip as well as at least one predetermined tear line (4) extending in longitudinal direction of the fiber strip, wherein the tear strength (daN) of the fiber strip, referred to the total denier (dtex) is at least about 1.7.times.10.sup.-4 daN/dtex, has a pair of transport rolls (8,9) for jointly transporting the supplied bands (1,2) and a crimping chamber (10.1, 10.1, 11, 12, 13, 14) which is arranged downstream of the pair of transport rolls (8, 9).
    Type: Grant
    Filed: January 2, 1997
    Date of Patent: January 19, 1999
    Assignee: Rhodia Acetow Aktiengesellschaft
    Inventor: Rudiger Dollhopf
  • Patent number: 5776404
    Abstract: A method is described for the production of a multiple width fiber strip consisting of crimped interlaced filaments and having several zones extending in longitudinal direction of the fiber strip as well as at least one predetermined tear line (4) extending in longitudinal direction of the fiber strip, wherein the tear strength (daN) of the fiber strip, referred to the total denier (dtex) is at least about 1.7.times.10.sup.-4 daN/dtex. The method produces one or several such fiber strips, with several separate bands (1, 2) being formed of substantially parallelly extending filaments and the formed bands being crimped jointly to produce one or several crimped fiber strips. The method makes possible the production of a multiple width fiber strip with the predetermined tear line referred to, processing on a double skein filter rod machine with a single (individual) treatment section.
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: July 7, 1998
    Assignee: Rhodia Acetow Aktiengesellschaft
    Inventor: Rudiger Dollhopf
  • Patent number: 5683777
    Abstract: The invention relates to a multiple width fiber strip consisting of crimped interlaced filaments and having several zones extending in longitudinal direction of the fiber strip as Well as at least one predetermined tear line (4) extending in longitudinal direction of the fiber strip, wherein the tear strength (daN) of the fiber strip, referred to the total denier (dtex) is at least about 1.7.times.10.sup.-4 daN/dtex. Further it relates to a method for producing one or several such fiber strips, with several separate bands (1, 2) being formed of substantially parallelly extending filaments and the formed bands being crimped jointly to produce one or several crimped fiber strips. The apparatus for carrying out this method is characterized by a pair of transport rolls (8, 9) for jointly transporting the supplied bands (1, 2) and a crimping chamber (10.1, 10.2, 11, 12, 13, 14) which is arranged after the pair of transport rolls (8, 9), for crimping the bands (1, 2) leaving the pair of transport rolls.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: November 4, 1997
    Assignee: Rhone-Poulenc Rhodia AG
    Inventor: Rudiger Dollhopf
  • Patent number: 5118267
    Abstract: A spinning pump (1) connected to a spinning pump block (2) by means of fastening screws (3) comprises a base plate (4) in contact with the connection face (11) of the spinning pump block (2), one or more gear plate (5), a cover plate (6), a drive shaft (7), an inlet channel (8) as well as outlet channels (9) for the spinning fluid, the channels (8, 9) are aligned with corresponding channels of the spinning pump block (2). The fastening screws (3) traverse through passage bores (12) an adapter part (15) connected with the cover plate (6) as well as plates (6,5,4) and are screwed into threaded bores (13) in the spinning pump block (2).
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: June 2, 1992
    Assignee: Rhone-Poulenc Rhodia Aktiengesellschaft
    Inventor: Rudiger Dollhopf
  • Patent number: 5103689
    Abstract: A gearing with two axis-parallel output shafts (2, 3) rotating in the same direction, for operation of a double screw extruder, has two pinions (4, 7) of equal size which are arranged in the annular space between an internally toothed ring gear (6) and an intermediate gear (5) in the spacing of the screws of the double screw extruder and mesh with the intermediate gear (5) and with the ring gear (6). The first of the two pinions (4) is arranged on the driving shaft (1), which is extended as output shaft (2). The second pinion (7) is arranged on the second output shaft (3). The gearing permits torque division of the torque from the driving shaft (1) to the two output shafts (2, 3).
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: April 14, 1992
    Assignee: Rhone-Poulenc Rhodia Aktiengesellschaft
    Inventor: Rudiger Dollhopf
  • Patent number: 5035355
    Abstract: A method of producing a warp beam, and the warp beam produced by this method are described.
    Type: Grant
    Filed: September 7, 1989
    Date of Patent: July 30, 1991
    Assignee: Rhone-Poulenc Rhodia Aktiengesellschaft
    Inventor: Rudiger Dollhopf
  • Patent number: 4959186
    Abstract: In the case of the extruder, the thread of the screw, or that of the screws, is partly left-handed and partly right-handed, so that one part of the material to be processed is conveyed in direction A, while the other part is conveyed in the opposite direction B. The process is a degasifying-extrusion-process and the extruder is a degasifying extruder. The apparatus includes a reverse-degasifying assembly (7,22) at the end (8,19) of the screw (1,16), or screws (1,16), if the material to be processed is carried away from this end, and/or a reverse-degasifying assembly (41,52) at the location between the threaded sections of the screw (1,16) or screws (1,16), so that the material to be processed is carried away in opposite directions B and A.
    Type: Grant
    Filed: September 22, 1988
    Date of Patent: September 25, 1990
    Assignee: Rhodia AG
    Inventors: Rudiger Dollhopf, Bernd Nandzik