US PATENT SUBCLASS 166 / 374
.~.~ Operated by fluid pressure controlled above ground
Current as of:
June, 1999
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166 /
HD
WELLS
244.1
DF
PROCESSES
{39}
373
DF
.~ Operating valve, closure, or changeable restrictor in a well {1}
374
.~.~ Operated by fluid pressure controlled above ground {1}
375
DF
.~.~.~
> By auxilliary fluid control line
DEFINITION
Classification: 166/374
Operated by fluid pressure controlled above ground:
(under subclass 373) Process wherein the flow regulating device is operated by a fluid pressure change which is initiated by an above ground operator.
(1) Note. The fluid pressure change is typically communicated to the flow controller by the conduit which the valve controls.
(2) Note. Changing the production flow to cause a change in pressure is subject matter in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72, for an above ground actuating means for a below ground device.
