US PATENT SUBCLASS 428 / 313.3
.~.~ Preformed hollow element-containing

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}
313.3.~.~ Preformed hollow element-containing {3}
313.5  DF  .~.~.~> Resin or rubber element
313.7  DF  .~.~.~> Mineral element
313.9  DF  .~.~.~> Metal- or silicon-containing element

DEFINITION

Classification: 428/313.3

Preformed hollow element-containing:

(under subclass 304.4) Subject matter wherein voids of the component result from the incorporation therein of a filler, aggregate, etc., which itself is hollow, rather than merely from voids, the walls of which constitute the material of the continuous matrix.

SEE OR SEARCH THIS CLASS, SUBCLASS:

320.6+, for a composite having in a component preformed capsules containing a color forming material.