US PATENT SUBCLASS 428 / 150
.~.~.~.~ Sand, clay, or crushed rock or slate

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}
141  DF  .~ Continuous and nonuniform or irregular surface on layer or component (e.g., roofing, etc.) {5}
143  DF  .~.~ Particulate matter {5}
149  DF  .~.~.~ Silicon containing {1}
150.~.~.~.~ Sand, clay, or crushed rock or slate

DEFINITION

Classification: 428/150

(under subclass 149) Product in which the silicon containing bits or granules are in the form of sand, clay or comminuted ordinary rock or that known as slate.