US PATENT SUBCLASS 175 / 4.6
.~ Concave-shaped charge

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

2  DF  BORING WITH EXPLOSION IN INACCESSIBLE HOLE {12}
4.6.~ Concave-shaped charge

DEFINITION

Classification: 175/4.6

(under subclass 2) Subject matter directed to means in which the explosive charge is hollowed or dished inwardly toward a central point to give a focused pressure to directly attack the formation or a wall member in the hole.