US PATENT SUBCLASS 166 / 272.7
.~.~.~ Horizontal well
Current as of:
June, 1999
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166 /
HD
WELLS
244.1
DF
PROCESSES
{39}
268
DF
.~ Distinct, separate injection and producing wells {7}
272.1
DF
.~.~ Involving the step of heating {4}
272.7
.~.~.~ Horizontal well
DEFINITION
Classification: 166/272.7
Horizontal well:
(under subclass 272.1) Heating in which the borehole is substantially parallel to the earth's surface.
