US PATENT SUBCLASS 175 / 430
.~.~.~.~ Having a noncircular or nonplanar cutting face

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

327  DF  BIT OR BIT ELEMENT {21}
425  DF  .~ Specific or diverse material {3}
426  DF  .~.~ Insert {2}
428  DF  .~.~.~ Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank) {5}
430.~.~.~.~ Having a noncircular or nonplanar cutting face

DEFINITION

Classification: 175/430

Having a Noncircular or nonplanar cutting face:

(under subclass 428) Structure in which the earth contacting portions either (1) defines a line or curve which is other than circular or (2) includes points which are not coplanar.

(1) Note. A circle with a notch is considered noncircular and a cutting face in the form of a sine wave is considered nonplanar. [figure]