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Class Information
Number: 175/4.57
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Projectile forms bore
Description: Subject matter comprising an apparatus or process for firing a missile.










Sub-classes under this class:

Class Number Class Name Patents
175/4.58 With means to initially restrain projectile for pressure build-up 5
175/4.59 With means to prevent preliminary bore fluid contact 5


Patents under this class:

Patent Number Title Of Patent Date Issued
7942481 Rock drill and method of breaking rock May. 17, 2011
7896104 Device and method for explosive drilling Mar. 1, 2011
6978848 Method and apparatus for penetrating subsurface formations Dec. 27, 2005
6591911 Multi-directional gun carrier method and apparatus Jul. 15, 2003
6523449 Perforating gun Feb. 25, 2003
6000479 Slimhole drill system Dec. 14, 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
4951744 Angularly shaped unitary structured base strip comprised of a specific material adapted for phasing charges in a perforating gun Aug. 28, 1990
4909152 Cartridge for the expulsion of liquids under pressure Mar. 20, 1990
4790383 Method and apparatus for multi-zone casing perforation Dec. 13, 1988
4638712 Bullet perforating apparatus, gun assembly and barrel Jan. 27, 1987
4419935 Explosive charging apparatus for charging explosive pellets to a bore in a rock Dec. 13, 1983
4220212 Apparatus for monitoring the operation of well bore guns Sep. 2, 1980
4193460 Perforating gun with paired shaped charger vertically spaced Mar. 18, 1980
4106574 Method for establishing high permeability flow path between boreholes Aug. 15, 1978
4099567 Generating medium BTU gas from coal in situ Jul. 11, 1978











 
 
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