US PATENT SUBCLASS 175 / 217
.~ With pump

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

207  DF  WITH ABOVE-GROUND MEANS FOR HANDLING DRILLING FLUID OR CUTTING {9}
217.~ With pump

DEFINITION

Classification: 175/217

(under subclass 207) Apparatus including pump means adapted to cause the drilling fluid to circulate.

(1) Note. The pump may be located below ground.

SEE OR SEARCH THIS CLASS, SUBCLASS:

212, for pressurized gas supplying means.

213, for drilling fluid handling systems in which a pump inlet communicates with the borehole bottom.

324, and the search there noted, for other means to induce fluent flow including a pump.