US PATENT SUBCLASS 175 / 212
.~ Pressurized gas supply
Current as of:
June, 1999
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175 /
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BORING OR PENETRATING THE EARTH
207
DF
WITH ABOVE-GROUND MEANS FOR HANDLING DRILLING FLUID OR CUTTING
{9}
212
.~ Pressurized gas supply
DEFINITION
Classification: 175/212
(under subclass 207) Apparatus including a means to provide a gas at above atmospheric pressure for use in the borehole.
SEE OR SEARCH THIS CLASS, SUBCLASS:
69, and 71, for processes of drilling with gas under pressure.
134, for means to flush the bore with motive fluid which may be pressurized gas.
205, for pressurized gas contact with flushing liquid.
SEE OR SEARCH CLASS
417, Pumps, for gas pumps of general utility.
418, Rotary Expansible Chamber Devices, for rotary expansible chamber pumps, per se.
