Patents Assigned to Ziegelwerke Heinrich Oltmanns
  • Plant for the production of tubular or hose-like articles of synthetic material
    Patent number: 4072453
    Abstract: A mobile plant for manufacturing corrugated drain pipe includes an extrusion apparatus, a pipe molding means and a coiling machine for coiling up the extruded pipe. The apparatus may conveniently be mounted in a trailer for transport.
    Type: Grant
    Filed: August 11, 1976
    Date of Patent: February 7, 1978
    Assignee: Ziegelwerke Heinrich Oltmanns
    Inventors: Heinrich Oltmanns, Klaus Volckmann