US PATENT SUBCLASS 405 / 56
.~.~.~ Including cooling or heating of material surrounding cavity

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

52  DF  FLUID CONTROL, TREATMENT, OR CONTAINMENT {7}
53  DF  .~ Fluid storage in earthen cavity {3}
55  DF  .~.~ Cavity construction {2}
56.~.~.~ Including cooling or heating of material surrounding cavity

DEFINITION

Classification: 405/56

Including cooling or heating of material surrounding cavity:

(under subclass 55) Method or apparatus including altering the temperature of the earth or water surrounding the cavity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

130+, for temperature modification of earthen formations not associated with fluid storage.

SEE OR SEARCH CLASS

165, Heat Exchange,

45, for a heat exchanger with a geos:graphical feature.