US PATENT SUBCLASS 428 / 217
.~.~ Hardness

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}
217.~.~ Hardness

DEFINITION

Classification: 428/217

(under subclass 212) Product in which the physical property relates to resistance to deformation or fracture by pressure.

(1) Note. Included in this subclass are recitations relating to units of measurement of hardness (e.g., Brinnell hardness, etc.).