US PATENT SUBCLASS 175 / 233
.~ Movable to seal sample receiver at bore bottom pressure

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}
233.~ Movable to seal sample receiver at bore bottom pressure

DEFINITION

Classification: 175/233

(under subclass 232) Apparatus in which the movable means seals, or cooperates with another means to seal a sample collecting chamber at the pressure which exists at the bottom of the bore.

SEE OR SEARCH THIS CLASS, SUBCLASS:

234+, for longitudinally spaced valve seats, wherein longitudinally spaced valves may be arranged, but are not described as sealing a sample receiver at bore bottom pressure.