US PATENT SUBCLASS 264 / 211.21
.~.~ Screw extruder or screw feeder device

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.~.~ Screw extruder or screw feeder device {2}
211.22  DF  .~.~.~> Filament (e.g., fiber, etc.)
211.23  DF  .~.~.~> Plural screws, plural extruders, or plural stage extruder

DEFINITION

Classification: 264/211.21

Screw extruder or screw feeder device:

(under subclass 176.1) Processes wherein a screw device is employed in the extruder or as a feeder or material worker for the extruder.