US PATENT SUBCLASS 428 / 170
.~.~ And varying density

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

98  DF  STRUCTURALLY DEFINED WEB OR SHEET (E.G., OVERALL DIMENSION, ETC.) {20}
156  DF  .~ Including variation in thickness {7}
170.~.~ And varying density {1}
171  DF  .~.~.~> Fiber containing component

DEFINITION

Classification: 428/170

(under subclass 156) Product wherein the mass per unit volume of the web, sheet, or component also varies.

(1) Note. This density usually varies with the thickness of such product as in a layer with compressed zones.