US PATENT SUBCLASS 405 / 57
.~.~.~ Earth treatment

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

DEFINITION

Classification: 405/57

Earth treatment:

(under subclass 55) Method or apparatus wherein the reservoir or storage chamber is formed or has its walls or boundaries conditioned by application of a chemical composition to the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

263+, for earth treatment by chemicals which is not related to fluid storage.

270, for application of a structure to an earthen formation to render the same impermeable.