US PATENT SUBCLASS 175 / 236
.~ In sample receiver removable through below-ground tool shaft

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

232  DF  WITH MEANS MOVABLE RELATIVE TO TOOL BELOW GROUND TO STOP FLOW TOWARD BORE BOTTOM {8}
236.~ In sample receiver removable through below-ground tool shaft

DEFINITION

Classification: 175/236

(under subclass 232) Apparatus in which the movable means is located in a means to receive a sample of the formation (undisturbed core, cuttings, etc.), and said sample receiving means is adapted to be taken above ground while the shaft which drives the tool remains in the borehole.

SEE OR SEARCH THIS CLASS, SUBCLASS:

246+, for a undisturbed sample receiver removable through a tool shaft.

257, and the subclasses there noted for a tool removable or insertable through or around a driving or driven shaft.