US PATENT SUBCLASS 428 / 307.3
.~.~.~ Void-containing component is inorganic

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}
306.6  DF  .~.~ Void-containing component partially impregnated with adjacent component {3}
307.3.~.~.~ Void-containing component is inorganic {1}
307.7  DF  .~.~.~.~> Inorganic impregnant

DEFINITION

Classification: 428/307.3

Void-containing component is inorganic:

(under subclass 306.6) Subject matter in which the matrix of the void-containing component is inorganic, e.g., carbide, metal, graphite, refractory, ceramic, glass, etc.