US PATENT SUBCLASS 405 / 55
.~.~ Cavity construction

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.~.~ Cavity construction {2}
56  DF  .~.~.~> Including cooling or heating of material surrounding cavity
57  DF  .~.~.~> Earth treatment {1}

DEFINITION

Classification: 405/55

Cavity construction:

(under subclass 53) Method or apparatus for the formation of an underground storage chamber or reservoir, or for features of the chamber walls or the surrounding earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

132+, for subject matter relating to shaft or tunnel construction.

SEE OR SEARCH CLASS

299, Mining or In Situ Disintegration of Hard Material, appropriate subclasses for subject matter relating to recovery of valuable material in situ, and particularly

2, for tunnel recovery of fluid material; and subclasses 3+ for in situ conversion of solid to fluid.