US PATENT SUBCLASS 175 / 4.59
.~.~ With means to prevent preliminary bore fluid contact

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}
4.57  DF  .~ Projectile forms bore {2}
4.59.~.~ With means to prevent preliminary bore fluid contact

DEFINITION

Classification: 175/4.59

(under subclass 4.57) Subject matter directed to means which are provided to prevent ambient fluid in the hole from coming in contact with the missile until propulsion of the missile commences.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.58, for subject matter directed to a device in which a means is adapted to initially restrain a projectile for pressure buildup and also prevent preliminary bore fluid contact.