US PATENT SUBCLASS 428 / 313.7
.~.~.~ Mineral element

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  DF  .~.~ Preformed hollow element-containing {3}
313.7.~.~.~ Mineral element

DEFINITION

Classification: 428/313.7

Mineral element:

(under subclass 313.3) Subject matter wherein the preformed hollow element is a mineral which is naturally void-containing or which has been treated to create voids, e.g., by heating, etc., such minerals including expanded vermiculite, perlite, mica, clay, etc.

SEE OR SEARCH CLASS

252, Compositions,

378, for exfoliated or intumesced compositions in general.