US PATENT SUBCLASS 405 / 109
.~.~.~ Having impervious core

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

52  DF  FLUID CONTROL, TREATMENT, OR CONTAINMENT {7}
80  DF  .~ Flow control {7}
107  DF  .~.~ Artificial water barrier (e.g., dam, levee, etc.) {7}
109.~.~.~ Having impervious core

DEFINITION

Classification: 405/109

Having impervious core:

(under subclass 107) Method or apparatus in which an impermeable center is placed in the barrier to prevent seepage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

263+, and 270, for impermeabilization of an earth formation, not associated with a dam, dike, or levee.