US PATENT SUBCLASS 428 / 315.9
.~.~.~ Composite has more than two layers

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

221  DF  WEB OR SHEET CONTAINING STRUCTURALLY DEFINED ELEMENT OR COMPONENT {9}
304.4  DF  .~ Composite having voids in a component (e.g., porous, cellular, etc.) {14}
315.5  DF  .~.~ Voids specified as micro {2}
315.9.~.~.~ Composite has more than two layers

DEFINITION

Classification: 428/315.9

Composite has more than two layers:

(under subclass 315.5) Subject matter in which the composite comprises at least three layers.