Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2005-10-25
2005-10-25
Sorkin, David (Department: 1723)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
C366S081000, C366S085000, C366S090000, C425S204000, C425S208000, C425S209000
Reexamination Certificate
active
06958128
ABSTRACT:
The present invention includes a screw tip for an extruder screw for effecting mixing in an extruder. The screw tip has a substantially conical outside surface and at least one discontinuous fin. The at least one fin protrudes from the outside surface of the screw tip.
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Rockwell Automation, Extrusion Processes, Publication D-7741, Mar. 2000.
Bowens Steven H.
Gates Thomas A.
Steele David H.
Valentine James N.
Certain-Teed Corporation
Duane Morris LLP
Sorkin David
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