US PATENT SUBCLASS 405 / 110
.~.~.~ Hollow or buttressed

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}
110.~.~.~ Hollow or buttressed {2}
111  DF  .~.~.~.~> With ballast compartment or cavity
112  DF  .~.~.~.~> Vertical wall buttress

DEFINITION

Classification: 405/110

Hollow or buttressed:

(under subclass 107) Method or apparatus in which the barrier is supported against the thrust of the water by some form of reinforcing structure either within or behind the barrier, or is made up of an empty shell closed front and rear.