US PATENT SUBCLASS 264 / 211.23
.~.~.~ Plural screws, plural extruders, or plural stage extruder

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}
211.21  DF  .~.~ Screw extruder or screw feeder device {2}
211.23.~.~.~ Plural screws, plural extruders, or plural stage extruder

DEFINITION

Classification: 264/211.23

Plural screws, plural screw extruders, or plural stage extruder:

(under subclass 211.21) Processes wherein the extruder employs more than one screw; more than one screw extruder; or plural different stages.

(1) Note. Extruders using different temperatures in different zones, or having threads of different pitch in different zones are proper for this subclass.