Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Reexamination Certificate
2002-08-01
2009-06-23
Huson, Monica A (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
C264S563000, C264S564000, C264S565000, C264S566000, C264S568000, C264S141000, C264S142000, C264S171260, C264S173150, C264S209200, C264S209300, C264S210200, C264S280000, C425S320000, C425S391000
Reexamination Certificate
active
07550102
ABSTRACT:
A method of making a composite tubular article made up of at least two concentric members, the outer of said members being tubular and the inner of said members being at least cylindrical and preferably tubular, and struts disposed in supporting and positioning orientation between the inner and outer members, by extruding a moldable material into the desired profile; stretching the inner tubular member over a cooling mandrel and disposing a cooling sleeve over the outer tubular member under conditions sufficient to solidify the article; twisting and longitudinally pulling the solidified article, so that it rotates over the cooling mandrel and inside the cooling sleeve while it is moving down stream across the cooling mandrel, whereby causing the extrudate to be twisted into a helical shape.
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Gilman Michael G.
Huson Monica A
Proteus, Inc.
Wollschlager Jeffrey
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