Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Reexamination Certificate
2007-07-24
2007-07-24
Cooley, Charles E. (Department: 1723)
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
Reexamination Certificate
active
10860899
ABSTRACT:
The present invention includes a screw tip for an extruder screw for effecting mixing in an extruder. The screw tip has a shaft portion and at least one mixing element ring connected to the shaft portion, or a mixing element having an aperture therethrough, or both. The mixing element may have two legs connected by a top portion with the aperture between the two legs to allow flow of extrudate therethrough.
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Bowens Steven H.
Briskie Donn L.
Gates Thomas A.
Steele David H.
Valentine James N.
Certainteed Corp.
Cooley Charles E.
Duane Morris LLP
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