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Class Information
Number: 175/4.58
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Projectile forms bore > With means to initially restrain projectile for pressure build-up
Description: Subject matter directed to means which are provided to temporarily hold back the missile at the time of firing the explosive charge so as to build up pressure behind the missile and propel the missile with high initial acceleration when the holding means is overcome.

Patents under this class:

Patent Number Title Of Patent Date Issued
6467387 Apparatus and method for propelling a data sensing apparatus into a subsurface formation Oct. 22, 2002
6148730 Method and apparatus for controlled small-charge blasting by pressurization of the bottom of a drill hole Nov. 21, 2000
6035784 Method and apparatus for controlled small-charge blasting of hard rock and concrete by explosive pressurization of the bottom of a drill hole Mar. 14, 2000
5810098 Method of breaking slabs and blocks of rock from rock formations and explosive shock transmitting and moderating composition for use therein Sep. 22, 1998
4648470 Firing head for a tubing conveyed perforating gun Mar. 10, 1987

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