Patents by Inventor Horst Rahn

Horst Rahn 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).

  • Method for producing multilayer metal composite tubes
    Patent number: 6822205
    Abstract: A process for the production of multi-layer metal composite tubes (10), wherein a metal strip is shaped to form a tube (16) and butt-welded along its two longitudinal edges. A plastic inner layer (12) is applied by extrusion in firmly adhering manner to the inside (12) of the metal tube (16) and a plastic outer layer (14) is applied by extrusion in firmly adhering manner to the outside (26) of the metal tube (16).
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: November 23, 2004
    Assignee: Uponor Innovation AB
    Inventor: Horst Rahn
  • Process for the production of corrugated plastic tubes
    Patent number: 6576180
    Abstract: In a process for the production of corrugated plastic tubes an extrusion device passes plastic material into a perpendicularly arranged injection head for injecting the plastic material into a perpendicularly arranged mold section comprising at least two pairs of movable mold jaws arranged in axially mutually superposed relationship. A drive device is associated with each pair of mold jaws for displacement thereof in the radial and axial directions.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: June 10, 2003
    Assignee: Corma Inc.
    Inventor: Horst Rahn
  • Method for producing multilayer metal composite tubes
    Publication number: 20030102302
    Abstract: Described is a process for the production of multi-layer metal composite tubes (10), wherein a metal strip is shaped to form a tube (16) and butt-welded along its two longitudinal edges. A plastic inner layer (12) is applied by extrusion in firmly adhering manner to the inside (12) of the metal tube (16) and a plastic outer layer (14) is applied by extrusion in firmly adhering manner to the outside (26) of the metal tube (16).
    Type: Application
    Filed: October 25, 2002
    Publication date: June 5, 2003
    Inventor: Horst Rahn
  • Apparatus for the production of corrugated plastic tubes
    Patent number: 6015282
    Abstract: In an apparatus for the production of corrugated plastic tubes an extrusion device passes plastic material into a perpendicularly arranged injection head for injecting the plastic material into a perpendicularly arranged mold section comprising at least two pairs of movable mold jaws arranged in axially mutually superposed relationship. A drive device is associated with each pair of mold jaws for displacement thereof in the radial and axial directions.
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: January 18, 2000
    Assignee: Unicor GmbH Rahn-Plastmaschinen
    Inventor: Horst Rahn
  • Method of producing an internally smooth, externally ribbed tube from extrudable plastic and apparatus for carrying out the method
    Patent number: 4983347
    Abstract: In the production of plastic tubes or pipes which are internally smooth-walled but have peripheral ribs externally, in particular from extrudable, more especially thermoplastic plastic such as PVC, a good filling of the cavities in the moving mold which are provided to form the ribs, is achieved in that said cavities are filled with the molten plastic first at a distance from the separating plane of the moving mold and last in the region of said separating plane.
    Type: Grant
    Filed: January 4, 1990
    Date of Patent: January 8, 1991
    Assignee: UNICOR GmbH Rahn Plastmaschinen
    Inventor: Horst Rahn
  • Apparatus for the continuous production of pipes with cross-profiled walls
    Patent number: 4787598
    Abstract: The invention relates to an apparatus for the continuous production of pipes with cross-profiled walls from a pipe strand of thermoplastic plastic emerging in still plastic state from an extrusion nozzle.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: November 29, 1988
    Assignee: Unicor GmbH
    Inventors: Horst Rahn, Helmut Grull