US PATENT SUBCLASS 175 / 239
.~ With undisturbed core receiver

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}
239.~ With undisturbed core receiver {1}
240  DF  .~.~> Movable means adapted to underlie severed core

DEFINITION

Classification: 175/239

(under subclass 232) Apparatus comprising the combination of a relatively movable, flow stopping means and structure adapted to admit and substantially encompass a cylinder of earth formation as it is being defined by an annular type bit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

236, for flow stopping movable means in sample receiver removable through below ground shaft.