US PATENT SUBCLASS 175 / 387
.~.~ Leading portion is core forming type


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

327  DF  BIT OR BIT ELEMENT {21}
385  DF  .~ Bit with leading portion (e.g., pilot) forming smaller diameter initial bore {6}
387.~.~ Leading portion is core forming type


DEFINITION

Classification: 175/387

(under subclass 385) Apparatus in which the leading or pilot portion has a cutter element or cutting edge so arranged that the bit makes an annular cut in the formation, leaving a

central undisturbed portion of the formation in the form of a cylinder.

SEE OR SEARCH THIS CLASS, SUBCLASS:

403+, and the search there noted for other core forming type bits.