US PATENT SUBCLASS 264 / 209.7
.~.~.~ At least two distinct operational temperatures employed during the extrusion operation

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

165  DF  FORMING CONTINUOUS OR INDEFINITE LENGTH WORK {8}
176.1  DF  .~ Shaping by extrusion {11}
209.1  DF  .~.~ Hollow article {5}
209.7.~.~.~ At least two distinct operational temperatures employed during the extrusion operation

DEFINITION

Classification: 264/209.7

At least two distinct operational temperatures employed during the extrusion operation:

(under subclass 209.1) Processes wherein at least two different temperatures are used at some point or time during the extrusion of the material.

(1) Note. A different temperature applied to the material subsequent to extrusion from the die is not sufficient to place in this subclass.

(2) Note. A different temperature at the outer wall of the extruder from the temperature of the inner (mandrel) wall is sufficient for this subclass.