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Class Information
Number: 175/4.59
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Projectile forms bore > With means to prevent preliminary bore fluid contact
Description: 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.

Patents under this class:

Patent Number Title Of Patent Date Issued
6557650 Method and apparatus for protecting explosives May. 6, 2003
6386296 Method and apparatus of protecting explosives May. 14, 2002
4467878 Shaped charge and carrier assembly therefor Aug. 28, 1984
4063509 Device for stimulation of geothermal wells Dec. 20, 1977
3939927 Combined gravel packing and perforating method and apparatus for use in well bores Feb. 24, 1976

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