TEMPERATURE MODIFICATION OR CONTROL OF EARTHEN FORMATION:
(under the class definition) Method or apparatus wherein the heat content of an earthen deposit is altered.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56, for temperature modification of the earth surrounding an underground storage cavity.
SEE OR SEARCH CLASS
165, Heat Exchange,
45, for a heat exchanger with a geos:graphical feature.
175, Boring or Penetrating the Earth,
17, for process or apparatus for boring combined with a step or means to heat or cool within the bore. 299, Mining or In Situ Disintegration of Hard Material,
3+, for subject matter involving mining and in situ conversion of solid material to fluid, including thawing earth when combined with excavating hard, solid material; and subclass 11 for a mining or in situ disintegration of hard material process including the stabilizing of underground earth structure.
