US PATENT SUBCLASS 405 / 237
.~.~.~.~ Forming subsurface enlargement

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

229  DF  FOUNDATION {2}
231  DF  .~ Columnar structure (e.g., pier, pile) {7}
232  DF  .~.~ Process or apparatus for installing {5}
233  DF  .~.~.~ Casting in situ hardenable fluent material {7}
237.~.~.~.~ Forming subsurface enlargement {1}
238  DF  .~.~.~.~.~> Preformed enlargement cavity

DEFINITION

Classification: 405/237

Forming subsurface enlargement:

(under subclass 233) Method or apparatus in which the configuration of the formed in situ member is such that a cross-sectional area below the surface in which the member is being formed will be greater than the cross-sectional area at the surface (e.g., the formation of a subsurface bulb or bulge).