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Class Information
Number: 175/4.55
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Independent firing of plural charges
Description: Subject matter directed to means including plural charges and a control to separately fire the charges.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8517120 Perforation tool with switch Aug. 27, 2013
8393392 Method and apparatus for perforating multiple wellbore intervals Mar. 12, 2013
8365824 Perforating and fracturing system Feb. 5, 2013
8281858 Shot perforator device and method for water well bore decommissioning Oct. 9, 2012
8157022 Apparatus string for use in a wellbore Apr. 17, 2012
8074737 Wireless perforating gun initiation Dec. 13, 2011
7980309 Method for selective activation of downhole devices in a tool string Jul. 19, 2011
7975592 Perforating apparatus, firing assembly, and method Jul. 12, 2011
7909115 Method for perforating utilizing a shaped charge in acidizing operations Mar. 22, 2011
7621342 Method for retaining debris in a perforating apparatus Nov. 24, 2009
7461580 Casing conveyed well perforating apparatus and method Dec. 9, 2008
7430965 Debris retention perforating apparatus and method for use of same Oct. 7, 2008
7350448 Perforating apparatus, firing assembly, and method Apr. 1, 2008
7347278 Secure activation of a downhole device Mar. 25, 2008
7284489 Casing conveyed well perforating apparatus and method Oct. 23, 2007
7172023 Perforating gun assembly and method for enhancing perforation depth Feb. 6, 2007
6962202 Casing conveyed well perforating apparatus and method Nov. 8, 2005
6877562 Oil well perforator Apr. 12, 2005
6758124 Unique phasings and firing sequences for perforating guns Jul. 6, 2004
6675896 Detonation transfer subassembly and method for use of same Jan. 13, 2004
6604584 Downhole activation system Aug. 12, 2003
6523449 Perforating gun Feb. 25, 2003
6283227 Downhole activation system that assigns and retrieves identifiers Sep. 4, 2001
5887654 Method for performing downhole functions Mar. 30, 1999
5388521 Method of reducing ground vibration from delay blasting Feb. 14, 1995
5278359 Simple multishot downhole explosive tool Jan. 11, 1994
5107929 Drop off method for perforating gun capsule charge carriers Apr. 28, 1992
5103912 Method and apparatus for completing deviated and horizontal wellbores Apr. 14, 1992
5042594 Apparatus for arming, testing, and sequentially firing a plurality of perforation apparatus Aug. 27, 1991
5022485 Method and apparatus for detonation of distributed charges Jun. 11, 1991
5007344 Dual firing system for a perforating gun Apr. 16, 1991
4991684 Method and apparatus for detonation of distributed charges Feb. 12, 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
4960171 Charge phasing arrangements in a perforating gun Oct. 2, 1990
4895218 Multishot downhole explosive device as a seismic source Jan. 23, 1990
4832134 Shaped charge assembly with retaining clip May. 23, 1989
4673033 Tubing conveyed perforating assembly safety device Jun. 16, 1987
4656944 Select fire well perforator system and method of operation Apr. 14, 1987
4648471 Control system for borehole tools Mar. 10, 1987
4635734 Boosterless perforating gun and method of assembly Jan. 13, 1987
4598771 Method and apparatus for firing a perforating gun and simultaneously recording the downhole pressure Jul. 8, 1986
4552234 Spiral gun apparatus Nov. 12, 1985
4527636 Single-wire selective perforation system having firing safeguards Jul. 9, 1985
4498391 Explosive mine breaking apparatus with arc-suppressing heat-dissipating fluid around the charge bodies Feb. 12, 1985
4496010 Single-wire selective performation system Jan. 29, 1985
4457383 High temperature selective fire perforating gun and switch therefor Jul. 3, 1984
4454814 Select-fire systems and methods for perforating guns Jun. 19, 1984
4324310 Seismic apparatus Apr. 13, 1982
4208966 Methods and apparatus for selectively operating multi-charge well bore guns Jun. 24, 1980
4194577 Method and apparatus for completing a slanted wellbore Mar. 25, 1980

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