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Class Information
Number: 175/2
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole
Description: 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.

Sub-classes under this class:

Class Number Class Name Patents
175/4.6 Concave-shaped charge 190
175/4.5 Directing successive projectiles or charges in same path 20
175/4 Driving core receiver by explosion or with receptacle collecting material in bore 20
175/3.5 Explosive charge carried by projectile 4
175/4.53 Firing chamber movable in bore relative to carrier or another firing chamber 15
175/4.56 Firing control mechanically actuated in bore 102
175/4.55 Independent firing of plural charges 59
175/4.57 Projectile forms bore 18
175/3 Severing formed core by explosion 1
175/4.54 With bore condition firing control, or compensating means 99
175/4.51 With position orienting or indicating 76
175/4.52 With wall engaging packer or anchor 89

Patents under this class:

Patent Number Title Of Patent Date Issued
8538698 Blasting method Sep. 17, 2013
8490686 Coupler compliance tuning for mitigating shock produced by well perforating Jul. 23, 2013
8418618 Method and apparatus for small-charge blasting Apr. 16, 2013
8408286 Perforating string with longitudinal shock de-coupler Apr. 2, 2013
8397800 Perforating string with longitudinal shock de-coupler Mar. 19, 2013
8393393 Coupler compliance tuning for mitigating shock produced by well perforating Mar. 12, 2013
8342261 Method and equipment for small-charge blasting Jan. 1, 2013
8099240 Blasting method Jan. 17, 2012
7854276 Methods, systems, and apparatus for production of hydrocarbons from a subterranean formation Dec. 21, 2010
7284601 Casing conveyed well perforating apparatus and method Oct. 23, 2007
7284489 Casing conveyed well perforating apparatus and method Oct. 23, 2007
7246548 Well perforating gun Jul. 24, 2007
7121340 Method and apparatus for reducing pressure in a perforating gun Oct. 17, 2006
7055421 Well perforating gun Jun. 6, 2006
7013988 Method and apparatus for moving a mass Mar. 21, 2006
6966378 Method and apparatus for perforating a well Nov. 22, 2005
6926096 Method for using a well perforating gun Aug. 9, 2005
6865978 Well perforating gun Mar. 15, 2005
6772105 Blasting method Aug. 3, 2004
6454359 Method for blasting tunnels using an air bladder Sep. 24, 2002
6371219 Oilwell perforator having metal loaded polymer matrix molded liner and case Apr. 16, 2002
6257353 Horizontal drilling method and apparatus Jul. 10, 2001
5996709 Projectile assisted drill for seismic operations Dec. 7, 1999
5765923 Cartridge for generating high-pressure gases in a drill hole Jun. 16, 1998
5436791 Perforating gun using an electrical safe arm device and a capacitor exploding foil initiator device Jul. 25, 1995
5421418 Apparatus and method for mixing polyacrylamide with brine in an annulus of a wellbore to prevent a cement-like mixture from fouling wellbore tools Jun. 6, 1995
5237136 Hydrostatic pressure responsive bypass safety switch Aug. 17, 1993
5192819 Bulk explosive charger Mar. 9, 1993
5020591 Oil tool coupling device Jun. 4, 1991
4967048 Safety switch for explosive well tools Oct. 30, 1990
4909152 Cartridge for the expulsion of liquids under pressure Mar. 20, 1990
4550786 Method of driving steel profiles into a rock substratum Nov. 5, 1985
4526233 Releasable coupling for tubing conveyed subterranean well perforating gun Jul. 2, 1985
4165690 Drill units for drilling and charge laying operations and method of carrying out the operations Aug. 28, 1979
4123975 Penetrating projectile system and apparatus Nov. 7, 1978
4057780 Method for describing fractures in subterranean earth formations Nov. 8, 1977

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