US PATENT SUBCLASS 175 / 246
.~ Receiver removable through below-ground tool shaft

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

244  DF  WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE {3}
246.~ Receiver removable through below-ground tool shaft {2}
247  DF  .~.~> With fluid pressure-responsive means to remove receiver or operate latch
248  DF  .~.~> Core forming cutting edge or element on receiver

DEFINITION

Classification: 175/246

(under subclass 244) Apparatus in which the movable means comprises a structure adapted to cooperate with a tool and hollow tool shaft to receive a core as it is taken, said structure and core then being readily lifted above ground through the center of the tool shaft while the tool shaft remains in the borehole.

SEE OR SEARCH THIS CLASS, SUBCLASS:

236, for sample receiver removable through below ground tool shaft, said receiver being provided with means movable to stop flow toward bore bottom.

257+, and the subclasses there noted for a tool or sample receiver insertable through a driving or driven tool shaft.

309, for a receptacle of general utility insertable or removable through a below ground tool shaft.