US PATENT SUBCLASS 405 / 238
.~.~.~.~.~ Preformed enlargement cavity

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  DF  .~.~.~.~ Forming subsurface enlargement {1}
238.~.~.~.~.~ Preformed enlargement cavity

DEFINITION

Classification: 405/238

Preformed enlargement cavity:

(under subclass 237) Method or apparatus including a step or means for forming an enlarged portion in an excavation prior to introducing a charge of flowable hardenable material therein to form the enlargement.