US PATENT SUBCLASS 175 / 237
.~ Means comprises dropped element

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}
237.~ Means comprises dropped element

DEFINITION

Classification: 175/237

(under subclass 232) Apparatus in which the movable means comprises an element which is described as being released in the tool shaft after said shaft is in the borehole to travel through a portion of said shaft to flow stopping position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

270, and the search there noted for a cutter element laterally shiftable below ground, and including a dropped element means.