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Class Information
Number: 175/4.54
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > With bore condition firing control, or compensating means
Description: Subject matter directed to means provided in the apparatus to (1) start, stop or modify operation of an explosive firing means in response to a sensed condition within the hole or (2) compensate for change in a hole condition due to exploding of a charge.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8622149 Ballistic transfer delay device Jan. 7, 2014
8584763 Managing pressurized fluid in a downhole tool Nov. 19, 2013
8424455 Surface safe explosive tool Apr. 23, 2013
8381822 Managing pressurized fluid in a downhole tool Feb. 26, 2013
8347963 Controlling transient underbalance in a wellbore Jan. 8, 2013
8157022 Apparatus string for use in a wellbore Apr. 17, 2012
8136608 Mitigating perforating gun shock Mar. 20, 2012
8113119 Surface safe explosive tool Feb. 14, 2012
8006762 System and method of controlling surge during wellbore completion Aug. 30, 2011
8002026 Methods and apparatuses for electronic time delay and systems including same Aug. 23, 2011
7984761 Openhole perforating Jul. 26, 2011
7861784 System and method of controlling surge during wellbore completion Jan. 4, 2011
7845410 Openhole perforating Dec. 7, 2010
7806035 Safety vent device Oct. 5, 2010
7789153 Methods and apparatuses for electronic time delay and systems including same Sep. 7, 2010
7721820 Buffer for explosive device May. 25, 2010
7712406 Method and device for activation of a detonator May. 11, 2010
7591212 Connector for perforating gun tandem Sep. 22, 2009
7565927 Monitoring an explosive device Jul. 28, 2009
7487833 Safety apparatus for perforating system Feb. 10, 2009
7387156 Perforating safety system Jun. 17, 2008
7287589 Well treatment system and method Oct. 30, 2007
7284612 Controlling transient pressure conditions in a wellbore Oct. 23, 2007
7246659 Damping fluid pressure waves in a subterranean well Jul. 24, 2007
6966377 Providing a low pressure condition in a wellbore region Nov. 22, 2005
6896059 Components and methods for use with explosives May. 24, 2005
6874579 Creating an underbalance condition in a wellbore Apr. 5, 2005
6742602 Perforating gun firing head with vented block for holding detonator Jun. 1, 2004
6561274 Method and apparatus for unloading well tubing May. 13, 2003
6554081 Components and methods for use with explosives Apr. 29, 2003
6435278 Firing head/perforating gun latching system and associated methods Aug. 20, 2002
6412573 System for indicating the firing of a perforating gun Jul. 2, 2002
6298924 Safety method and apparatus for a perforating gun Oct. 9, 2001
6213203 Lock mechanism for use with a downhole device Apr. 10, 2001
6182750 Device for performing downhole functions Feb. 6, 2001
6179064 System for indicating the firing of a perforating gun Jan. 30, 2001
6105688 Safety method and apparatus for a perforating gun Aug. 22, 2000
6095258 Pressure actuated safety switch for oil well perforating Aug. 1, 2000
6062310 Full bore gun system May. 16, 2000
6053111 Surface safe rig environment detonator Apr. 25, 2000
6035880 Pressure activated switch valve Mar. 14, 2000
5887654 Method for performing downhole functions Mar. 30, 1999
5700968 Perforating gun brake Dec. 23, 1997
5680905 Apparatus and method for perforating wellbores Oct. 28, 1997
5632348 Fluid activated detonating system May. 27, 1997
5603384 Universal perforating gun firing head Feb. 18, 1997
5598894 Select fire multiple drill string tester Feb. 4, 1997
5551520 Dual redundant detonating system for oil well perforators Sep. 3, 1996
5392860 Heat activated safety fuse Feb. 28, 1995
5369579 Electronic blast control system for downhole well operations Nov. 29, 1994

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