US PATENT SUBCLASS 241 / 261.3
.~.~.~.~.~.~ Having plural angularly related land and groove

Current as of: June, 1999
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241 /   HD   SOLID MATERIAL COMMINUTION OR DISINTEGRATION

*  DD  APPARATUS {41}
198.1  DF  .~ Cooperating comminuting surfaces (e.g., jaw crusher) {5}
220  DF  .~.~ Rotary surface (or surfaces) {2}
244  DF  .~.~.~ Axial or radial flow of material (e.g., disc mill, or cone and shell mill) {6}
260  DF  .~.~.~.~ Cooperating non-smooth surface characteristics {4}
261.2  DF  .~.~.~.~.~ Opposed, flat coaxial surfaces (e.g., disk mill) {1}
261.3.~.~.~.~.~.~ Having plural angularly related land and groove

DEFINITION

Classification: 241/261.3

(under subclass 261.2) Apparatus provided with ribs or channels which intersect each other, or which would intersect within the confines of the surface if extended.