US PATENT SUBCLASS 428 / 311.11
.~.~ Void-containing component has a continuous matrix of fibers only (e.g., porous paper, etc.)

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}
311.11.~.~ Void-containing component has a continuous matrix of fibers only (e.g., porous paper, etc.) {2}
311.31  DF  .~.~.~> And a force disintegratable component (e.g., stencil sheet, etc.)
311.51  DF  .~.~.~> Fibers of defined composition {1}

DEFINITION

Classification: 428/311.11

Void-containing component has a continuous matrix of fibers only (e.g., porous paper, etc.):

(under subclass 304.4) Subject matter wherein a component of the composite is one which depends solely upon fibers for its continuity.