US PATENT SUBCLASS 428 / 307.7
.~.~.~.~ Inorganic impregnant


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  DF  .~.~.~ Void-containing component is inorganic {1}
307.7.~.~.~.~ Inorganic impregnant


DEFINITION

Classification: 428/307.7

Inorganic impregnant:

(under subclass 307.3) Subject matter in which the impregnant

also is inorganic, e.g., glass, hydraulic cement, etc.