US PATENT SUBCLASS 175 / 332
.~.~ Core forming-type bit

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

327  DF  BIT OR BIT ELEMENT {21}
331  DF  .~ Rolling cutter bit or rolling cutter bit element {26}
332.~.~ Core forming-type bit {1}
333  DF  .~.~.~> With core-breaking means

DEFINITION

Classification: 175/332

(under subclass 331) Apparatus in which the rolling cutter element or a fixed cutting edge of the bit is so arranged that the bit makes an annular cut in the formation and leaves 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.