US PATENT SUBCLASS 428 / 218
.~.~ Density or compression of components

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}
212  DF  .~ Including components having same physical characteristic in differing degree {3}
218.~.~ Density or compression of components

DEFINITION

Classification: 428/218

(under subclass 212) Product in which the physical property relates to a weight per unit volume of the component or the degree of compactness thereof.