US PATENT SUBCLASS 428 / 172
.~.~ Composite web or sheet

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

98  DF  STRUCTURALLY DEFINED WEB OR SHEET (E.G., OVERALL DIMENSION, ETC.) {20}
156  DF  .~ Including variation in thickness {7}
172.~.~ Composite web or sheet {1}
173  DF  .~.~.~> With partial filling of valleys on outer surface

DEFINITION

Classification: 428/172

(under subclass 156) Product comprising at least two layers.