US PATENT SUBCLASS 175 / 2
BORING WITH EXPLOSION IN INACCESSIBLE HOLE

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

2BORING WITH EXPLOSION IN INACCESSIBLE HOLE {12}
3  DF  .~> Severing formed core by explosion
3.5  DF  .~> Explosive charge carried by projectile
4  DF  .~> Driving core receiver by explosion or with receptacle collecting material in bore
4.5  DF  .~> Directing successive projectiles or charges in same path
4.51  DF  .~> With position orienting or indicating
4.52  DF  .~> With wall engaging packer or anchor
4.53  DF  .~> Firing chamber movable in bore relative to carrier or another firing chamber
4.54  DF  .~> With bore condition firing control, or compensating means
4.55  DF  .~> Independent firing of plural charges
4.56  DF  .~> Firing control mechanically actuated in bore
4.57  DF  .~> Projectile forms bore {2}
4.6  DF  .~> Concave-shaped charge

DEFINITION

Classification: 175/2

(under the class definition) Process or apparatus comprising subject matter directed to exploding a charge in an inaccessible hole to directly attack the formation or to

propel an object such as a bullet into the formation.

(1) Note. Internal combustion motors and similar devices operating below the surface of the ground are excluded and found in subclasses 92+.

(2) Note. Subject matter directed to a device described as for causing a below ground explosive charge or projectile to extend or enlarge a bore or perforate the formation or a wall member in the hole is classified under this definition if (1) the sole disclosure is for use in an in-accessible hole or (2) there is a specific disclosure for use in an inaccessible hole. However, an explosive device which is described as adapted to cause a blast of general utility or a gun or general utility even though incidentally described as usable to extend, enlarge or perforate the formation or a wall member in the hole is classified in the appropriate subclasses.

(3) Note. Devices which fire bullets or charges in a manner that would inherently penetrate an earth formation in an inaccessible hole are included under this definition even though the specific disclosure for use in an inaccessible hole is limited to perforating or severing a casing or a wall member in the hole.

SEE OR SEARCH CLASS

89, Ordnance, appropriate subclasses for means for firing explosive projectiles. 102, Ammunition and Explosives, appropriate subclasses and particularly

20+, and 22+ for an explosive charge below ground for fracturing or breaking up the formation.

166, Wells,

299, for a well process including an explosive step, subclasses 55+ for means for perforating or cutting pipe at an unprepared point including explosive means which does not inherently cause penetration of an earth formation to form a bore, and subclass 63 for a well apparatus with explosive means.

299, Mining or In Situ Disintegration of Hard Material,

13, for a process including a blasting step for recovering valuable material from the earth or breaking up hard material in situ.