US PATENT SUBCLASS 428 / 309.9
.~.~ With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers

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}
309.9.~.~ With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers

DEFINITION

Classification: 428/309.9

With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers:

(under subclass 304.4) Subject matter wherein an interface between layers of a composite is claimed in such fashion that a wavy, keyed or otherwise nonflat function of the layers is required to meet the terms of the claims or an intermediate layer is created by commingling some material of two adjacent foam layers, usually in fluent form or wherein an element of the composite such as a fiber, etc., passes from one layer to another of the composite.

SEE OR SEARCH THIS CLASS, SUBCLASS:

609, and 612, for similar subject matter which is all metal or has adjacent metals.