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Class Information
Number: 175/4.56
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Firing control mechanically actuated in bore
Description: Subject matter directed to a mechanical control means which is actuated in the hole to explode the charge.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8579022 Apparatus for deploying and activating a downhole tool Nov. 12, 2013
8517120 Perforation tool with switch Aug. 27, 2013
8210105 Method and device for detonating an explosive charge Jul. 3, 2012
8079296 Device and methods for firing perforating guns Dec. 20, 2011
8006779 Pressure cycle operated perforating firing head Aug. 30, 2011
7886842 Apparatus and method for orienting a wellbore servicing tool Feb. 15, 2011
7770662 Ballistic systems having an impedance barrier Aug. 10, 2010
7246659 Damping fluid pressure waves in a subterranean well Jul. 24, 2007
6918334 Perforating gun firing head with vented block for holding detonator Jul. 19, 2005
6779605 Downhole tool deployment safety system and methods Aug. 24, 2004
6675896 Detonation transfer subassembly and method for use of same Jan. 13, 2004
6662883 Charge tube assembly for a perforating gun Dec. 16, 2003
6220370 Circulating gun system Apr. 24, 2001
6213203 Lock mechanism for use with a downhole device Apr. 10, 2001
6179064 System for indicating the firing of a perforating gun Jan. 30, 2001
6148916 Apparatus for releasing, then firing perforating guns Nov. 21, 2000
6095258 Pressure actuated safety switch for oil well perforating Aug. 1, 2000
6035880 Pressure activated switch valve Mar. 14, 2000
5911277 System for activating a perforating device in a well Jun. 15, 1999
5908365 Downhole triggering device Jun. 1, 1999
5887654 Method for performing downhole functions Mar. 30, 1999
5680905 Apparatus and method for perforating wellbores Oct. 28, 1997
5603384 Universal perforating gun firing head Feb. 18, 1997
5571986 Method and apparatus for activating an electric wireline firing system Nov. 5, 1996
5551520 Dual redundant detonating system for oil well perforators Sep. 3, 1996
5540293 Firing Head Jul. 30, 1996
5490563 Perforating gun actuator Feb. 13, 1996
5449039 Apparatus and method for horizontal well fracture stimulation Sep. 12, 1995
5301755 Air chamber actuator for a perforating gun Apr. 12, 1994
5237136 Hydrostatic pressure responsive bypass safety switch Aug. 17, 1993
5223665 Method and apparatus for disabling detonation system for a downhole explosive assembly Jun. 29, 1993
5215148 Subsurface well pressure actuated and fired apparatus Jun. 1, 1993
5191936 Method and apparatus for controlling a well tool suspended by a cable in a wellbore by selective axial movements of the cable Mar. 9, 1993
5167282 Apparatus and method for detonating well perforators Dec. 1, 1992
5161616 Differential firing head and method of operation thereof Nov. 10, 1992
5159145 Methods and apparatus for disarming and arming well bore explosive tools Oct. 27, 1992
5131472 Overbalance perforating and stimulation method for wells Jul. 21, 1992
5052484 Electrical connector and contact assembly for vehicles Oct. 1, 1991
5050672 Pump apparatus including a firing head for use with a perforating gun on a tubing string Sep. 24, 1991
5042593 Hydraulically damped detonator for use in perforating oil well tubing Aug. 27, 1991
5007344 Dual firing system for a perforating gun Apr. 16, 1991
4971160 Perforating and testing apparatus including a microprocessor implemented control system responsive to an output from an inductive coupler or other input stimulus Nov. 20, 1990
4967048 Safety switch for explosive well tools Oct. 30, 1990
4924952 Detonating heads May. 15, 1990
4911251 Method and apparatus for actuating a tubing conveyed perforating gun Mar. 27, 1990
4886127 Apparatus for firing borehole perforating apparatus Dec. 12, 1989
4850438 Modular perforating gun Jul. 25, 1989
4815540 Method and apparatus for releasing a well perforating gun from a supporting tubing string Mar. 28, 1989
4790385 Method and apparatus for perforating subsurface earth formations Dec. 13, 1988
4776393 Perforating gun automatic release mechanism Oct. 11, 1988

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