Patents Assigned to Polysource, Inc.
  • Polystyrene beads
    Patent number: 6365275
    Abstract: Substantially cylindrical unexpanded polystyrene beads with a diameter on the order of 1 mm and a length on the order of 3 mm are expanded into substantially cylindrical expanded polystyrene beads with a diameter between about 2 and 5 mm, and a length between about 4 and 10 mm. These expanded beads are well suited for use as a substitute for concrete aggregate to make lightweight concrete and concrete construction boards.
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: April 2, 2002
    Assignee: Polysource, Inc.
    Inventor: Erik W. Wehtje
  • Concrete mix containing polystyrene beads
    Patent number: 6218002
    Abstract: Substantially cylindrical unexpanded polystyrene beads with a diameter on the order of 1 mm and a length on the order of 3 mm are expanded into substantially cylindrical expanded polystyrene beads with a diameter between about 2 and 5 mm, and a length between about 4 and 10 mm. These expanded beads are well suited for use as a substitute for concrete aggregate to make lightweight concrete and concrete construction boards.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: April 17, 2001
    Assignee: Polysource, Inc.
    Inventor: Erik W. Wehtje
  • Apparatus for manufacturing expandable polystyrene (EPS) pellets
    Patent number: 5573790
    Abstract: A device for manufacturing expandable polystyrene (EPS) pellets includes a continuous process extruder, a die, a pelletizer and a hot water annealing quencher assembly. The pelletizer cuts strands of EPS material extruded from the extruder and die into uniform EPS pellets. The annealing quencher assembly includes a quencher tank, a water vortex substantially immersed therein for generating a slurry of water and EPS pellets discharged from the pelletizer, a quenching loop, and a slurry pump for pumping the slurry from the water vortex through the quenching loop to thereby anneal the EPS pellets.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: November 12, 1996
    Assignee: Polysource Inc.
    Inventors: Erik W. Wehtje, Erik T. Anderlind
  • Apparatus for manufacturing expandable polystyrene (EPS) pellets
    Patent number: 5267845
    Abstract: A device for manufacturing expandable polystyrene (EPS) pellets includes a continuous process extruder, a die, a pelletizer and a hot water annealing quencher assembly. The pelletizer cuts strands of EPS material extruded from the extruder and die into uniform EPS pellets. The annealing quencher assembly includes a quencher tank, a water vortex substantially immersed therein for generating a slurry of water and EPS pellets discharged from the pelletizer, a quenching loop, and a slurry pump for pumping the slurry from the water vortex through the quenching loop to thereby anneal the EPS pellets.
    Type: Grant
    Filed: May 13, 1992
    Date of Patent: December 7, 1993
    Assignee: Polysource, Inc.
    Inventors: Erik T. Anderlind, Erik W. Wehtje