US PATENT SUBCLASS 405 / 270
.~ Impermeabilization

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

258  DF  EARTH TREATMENT OR CONTROL {5}
270.~ Impermeabilization

DEFINITION

Classification: 405/270

Impermeabilization:

(under subclass 258) Method or apparatus wherein a structure is applied to an earth formation to make the same resistant to the flow of liquids.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38, for a subsurface moisture barrier placed between two horizontal layers of earth for drainage or irrigation purposes.

53+, for a fluid storage cavity in or on the earth provided with a fluid impermeable barrier.

267, for a method or apparatus for placing a cementitious material in an excavation to form an impermeable barrier.

268, for a method or apparatus for coating an earthen formation with a cementitious material to render said formation impermeable.