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Class Information
Number: 175/4.5
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Directing successive projectiles or charges in same path
Description: Subject matter directed to plural charges or bullets which are fired through the same gun barrel and/or in succession in the same direction and along the same line into the formation without removing the firing apparatus from the hole.

Patents under this class:

Patent Number Title Of Patent Date Issued
7896104 Device and method for explosive drilling Mar. 1, 2011
6865792 Method for making a well perforating gun Mar. 15, 2005
6591731 Method and apparatus for penetrating hard materials using a energetic slurry Jul. 15, 2003
6533040 Multi-function apparatus for adding a branch well sealed liner and connector to an existing cased well at low cost Mar. 18, 2003
6405628 Method and apparatus for penetrating hard materials Jun. 18, 2002
6275758 Method and apparatus for determining a cross slope of a surface Aug. 14, 2001
6082450 Apparatus and method for stimulating a subterranean formation Jul. 4, 2000
5996709 Projectile assisted drill for seismic operations Dec. 7, 1999
5633475 Circulation shaped charge May. 27, 1997
5168939 Electromagnetically accelerated impact oil well drill Dec. 8, 1992
4997047 High speed electromagnetically accelerated earth drill Mar. 5, 1991
4592282 Charging apparatus for cartridged explosives Jun. 3, 1986
4582147 Directional drilling Apr. 15, 1986
4522129 Device for charging drillholes Jun. 11, 1985
4474250 Measuring while drilling Oct. 2, 1984
4040355 Excavation apparatus and method Aug. 9, 1977
4030557 Well drilling apparatus and method Jun. 21, 1977
4018293 Method and apparatus for controlled fracturing of subterranean formations Apr. 19, 1977
4004642 Tround terra-drill processes and apparatus Jan. 25, 1977
3963275 Method of breaking free-standing rock boulders Jun. 15, 1976

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