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Class Information
Number: 175/297
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Fluid-operated > Restricted orifice for initially delaying escape of restraining fluid
Description: Apparatus in which said relieving means comprises a restricted orifice through which said fluid may escape when placed under pressure to allow unrestrained movement of said hammer or impact device after a predetermined amount of said fluid has escaped.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8657007 Hydraulic jar with low reset force Feb. 25, 2014
8651202 Percussion drilling assembly having a floating feed tube Feb. 18, 2014
8561730 Foot valve assembly for a down hole drill Oct. 22, 2013
8550155 Jarring method and apparatus using fluid pressure to reset jar Oct. 8, 2013
8544567 Drill bit with a flow interrupter Oct. 1, 2013
8505653 Downhole apparatus Aug. 13, 2013
8365818 Jarring method and apparatus using fluid pressure to reset jar Feb. 5, 2013
8230912 Hydraulic bidirectional jar Jul. 31, 2012
8205690 Dual acting locking jar Jun. 26, 2012
8151910 Drilling jar Apr. 10, 2012
8127864 Hydro-percussive mechanisms for drilling systems Mar. 6, 2012
8011455 Down hole hammer having elevated exhaust Sep. 6, 2011
8011427 Double-acting jar Sep. 6, 2011
7814995 Hydraulic jar and an overpressure relief mechanism therefor Oct. 19, 2010
7753116 Double-acting jar Jul. 13, 2010
7748478 Percussion drilling assembly and hammer bit with an adjustable choke Jul. 6, 2010
7712552 Water hammer May. 11, 2010
7665550 Underreamer and method of use Feb. 23, 2010
7617886 Fluid-actuated hammer bit Nov. 17, 2009
7461706 Drilling apparatus with percussive action cutter Dec. 9, 2008
7419015 Rock drilling machine and axial bearing Sep. 2, 2008
7392857 Apparatus and method for vibrating a drill bit Jul. 1, 2008
7377338 Downhole percussion tool May. 27, 2008
7347287 Hydraulic timing device Mar. 25, 2008
7290604 Downhole tool with pressure balancing Nov. 6, 2007
7219726 Method and apparatus to vibrate a downhole component May. 22, 2007
7073610 Downhole tool Jul. 11, 2006
7066263 Tension multiplier jar apparatus and method of operation Jun. 27, 2006
7017681 Device for performing hydrodynamic action on wellbore walls Mar. 28, 2006
6953098 Hydraulic drill string accumulator Oct. 11, 2005
6907927 Method and apparatus to vibrate a downhole component Jun. 21, 2005
6729419 Electro-mechanical drilling jar May. 4, 2004
6725932 Down hole jar tool Apr. 27, 2004
6655460 Methods and apparatus to control downhole tools Dec. 2, 2003
6571870 Method and apparatus to vibrate a downhole component Jun. 3, 2003
6453997 Hydraulically driven fishing jars Sep. 24, 2002
6308779 Hydraulically driven fishing jars Oct. 30, 2001
6263986 Hydraulic drilling jar Jul. 24, 2001
6202767 Double acting hydraulic jar Mar. 20, 2001
6135217 Converted dual-acting hydraulic drilling jar Oct. 24, 2000
5984028 Converted dual-acting hydraulic drilling jar Nov. 16, 1999
5937956 Ram boring machine Aug. 17, 1999
5918689 Jar enhancer Jul. 6, 1999
5906239 Jarring tool May. 25, 1999
5775423 Valve for a two way hydraulic drilling jar and a two way hydraulic drilling jar Jul. 7, 1998
5715897 In-hole rock drilling machine with a hydraulic impact motor Feb. 10, 1998
5647446 Two way hydraulic drilling jar Jul. 15, 1997
5595253 Hydraulic jar with improved detent ring Jan. 21, 1997
5584353 Well jar accelerator with expansion chamber Dec. 17, 1996
5503228 Jar apparatus and method of jarring Apr. 2, 1996

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