US PATENT SUBCLASS 264 / 173.16
.~.~ Melt co-extrusion (e.g., two layers, etc.)

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}
171.1  DF  .~ Layered, stratified traversely of length, or multiphase macrostructure containing material (e.g., conjugate, composite, islands-in-sea, core-sheath, etc.) {8}
173.16.~.~ Melt co-extrusion (e.g., two layers, etc.) {4}
173.17  DF  .~.~.~> Having particular noncircular cross-section (e.g., T-configured, etc.)
173.18  DF  .~.~.~> Having colorant added to material to be shaped or producing two diverse colored layers
173.19  DF  .~.~.~> Polyamide (e.g., nylon, etc.) or addition polymer of at least one monoethylenically unsaturated monomer (e.g., polyethylene, polypropylene, polystyrene, etc.) containing layer {1}
174.11  DF  .~.~.~> Natural rubber or elastomer containing layer

DEFINITION

Classification: 264/173.16

Melt co-extrusion (e.g., two layers, etc.):

(under subclass 171.1) Processes wherein a layered indefinite length body is formed by forcing a melt through a dual confining orifice whereby the cross-sectional area of the two extruded portions corresponds to the dimensions of the orifice.