US PATENT SUBCLASS 405 / 58
.~.~.~.~ Dissolving earth

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}
57  DF  .~.~.~ Earth treatment {1}
58.~.~.~.~ Dissolving earth

DEFINITION

Classification: 405/58

Dissolving earth:

(under subclass 57) Method or apparatus wherein the reservoir or storage chamber is formed by disintegrating earthen material, usually by contacting the material with a solvent.