US PATENT SUBCLASS 405 / 253
.~.~ With driving or cutting tip

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}
253.~.~ With driving or cutting tip {1}
254  DF  .~.~.~> Longitudinally ribbed

DEFINITION

Classification: 405/253

With driving or cutting tip:

(under subclass 231) Method or apparatus relating to the provision of means at the lower end of the elongated member to facilitate penetration of the member into the earth when an external force is applied to said member.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

19+, for drive points for boring without earth removal; and subclasses 414+ for impact-type bits.