US PATENT SUBCLASS 264 / 173.11
.~.~ Having three or more layers of at least two different compositions

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}
173.11.~.~ Having three or more layers of at least two different compositions {1}
173.12  DF  .~.~.~> Melt extrusion (e.g., co-extrusion, etc.) {3}

DEFINITION

Classification: 264/173.11

Having three or more layers of at least two different compositions:

(under subclass 171.1) Processes directed to forming a composite which has more than two layers wherein the material comprising at least one of the layers is dissimilar.