US PATENT SUBCLASS 405 / 249
.~.~.~ Caisson or hollow shaft

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}
249.~.~.~ Caisson or hollow shaft

DEFINITION

Classification: 405/249

Caisson or hollow shaft:

(under subclass 232) Method or apparatus wherein the cross section of the elongated member is initially in the shape of an annulus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8+, for pressurized pneumatic caissons.

133, for subject matter relating to a vertical passageway in the earth.

233+, for methods or apparatus for casting a hollow pier or filling a caisson with concrete in situ.

256+, for a concrete hollow pier or caisson.