US PATENT SUBCLASS 428 / 313.9
.~.~.~ Metal- or silicon-containing 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}
313.9.~.~.~ Metal- or silicon-containing element

DEFINITION

Classification: 428/313.9

Metal- or silicon-containing element:

(under subclass 313.3) Subject matter wherein the element contains metal or silicon in free or combined form, e.g., refractory, ceramic, glass, etc.