US PATENT SUBCLASS 428 / 311.31
.~.~.~ And a force disintegratable component (e.g., stencil sheet, 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  DF  .~.~ Void-containing component has a continuous matrix of fibers only (e.g., porous paper, etc.) {2}
311.31.~.~.~ And a force disintegratable component (e.g., stencil sheet, etc.)

DEFINITION

Classification: 428/311.31

And a force disintegratable component (e.g., stencil sheet, etc.):

(under subclass 311.11) Subject matter wherein a component of the composite may be locally disintegrated by the application of a sudden force thereto; for example, by a typewriter key.

(l) Note. Where the product is designated as having a stencil sheet, wherein an ink is to pass through the product in its final use, it is assumed that the nondisintegrated component is porous. See the definition of subclass 304.4, (1) Note, (b).

SEE OR SEARCH THIS CLASS, SUBCLASS:

321.1+, for a composite which includes liquid.

488.1, for so-called "carbon paper", comprising not necessarily porous paper and a waxy component having pigment, dye, or color forming reagent.