US PATENT SUBCLASS 428 / 314.4
.~.~ Voids specified as closed

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}
314.4.~.~ Voids specified as closed {1}
314.8  DF  .~.~.~> Specified thickness of void-containing component (absolute or relative), numerical cell dimension or density

DEFINITION

Classification: 428/314.4

Voids specified as closed:

(under subclass 304.4) Subject matter wherein the voids in the void-containing component are specified as being closed, rather than forming a series of interconnected voids, e.g., closed-cell foam, etc.