US PATENT SUBCLASS 166 / 57
WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS

Current as of: June, 1999
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166 /   HD   WELLS

57WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS {5}
58  DF  .~> Fuel supply or hot billet in well
59  DF  .~> Burner in well
60  DF  .~> Electrical heater in well
61  DF  .~> Heater surrounding production tube
62  DF  .~> With eduction pump or plunger in well

DEFINITION

Classification: 166/57

(under the class definition) Devices for causing a heating, refrigerating or heat insulating effect.

(1) Note. For classification in this and indented subclasses the apparatus must be described as purposely intended to perform the said functions. An apparatus adapted to perform some other function and causing a mere inherent, unclaimed heating, refrigerating or insulating effect is not classified in this group of subclasses. Such apparatus is classified on other features.

(2) Note. The mere use of the earth as an insulating means, (as when a tunnel is used to inject fluid in a well and the earth above the tunnel insulates it) is not included. See subclasses 75.11+ (especially 90.1) for such devices.

(3) Note. Where the sole function of an element is described as for supplying a heating or refrigerating or insulating effect, classification is in this or indented subclasses even if such function is not claimed.

(4) Note. A device comprising a heating means used merely to set off an explosion, the explosion being intended to accomplish some function due to the violent pressure exerted and not due to heat is not classified in subclasses 57+. See subclasses 55 and 63 for such devices.

(5) Note. An internal combustion engine, per se, is not considered a heating means if the only use of the engine is for driving a shaft or the like. SEE OR SEARCH THIS CLASS, SUBCLASS:

90, for nozzles for inserting a steam into a casing, casing head or tubing to extinguish a fire.

302, and the subclasses there noted for processes involving heating.

SEE OR SEARCH CLASS

126, Stoves and Furnaces, appropriate subclasses for heaters of general utility.

175, Boring or Penetrating the Earth,

11+, for processes or apparatus for boring by directly applying heat to fluidize or comminute the earth formation and subclass 17 for processes or apparatus including heating or cooling within the bore, or heating or cooling the drilling fluid.

417, Pumps,

73+, for combustion type pumps for wells.

431, Combustion, appropriate subclass for a burner, per se, particularly

202, for a burner broadly related to other structures or having a geos:graphic feature.

432, Heating, appropriate subclasses for a residual means for application of heat to materials or bodies.