US PATENT SUBCLASS 166 / 61
.~ Heater surrounding production tube

Current as of: June, 1999
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166 /   HD   WELLS

57  DF  WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS {5}
61.~ Heater surrounding production tube

DEFINITION

Classification: 166/61

(under subclass 57) Devices in which a heating means surrounds the well conduit through which the earth fluid flows to the surface of the ground.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62, for devices in which a heater surrounds only a pump rather than the conduit.