US PATENT SUBCLASS 175 / 428
.~.~.~ Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank)

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.~.~.~ Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank) {5}
429  DF  .~.~.~.~> Including a nozzle
430  DF  .~.~.~.~> Having a noncircular or nonplanar cutting face
431  DF  .~.~.~.~> Having a particular orientation or location
432  DF  .~.~.~.~> With support detail
433  DF  .~.~.~.~> Having a specified thermal property

DEFINITION

Classification: 175/428

Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank):

(under subclass 426) Structure where the insert comprises an earth contacting portion that is fixed to a backing or substructure which is then placed in the bit aperture.