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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 5495902 |
Coil tubing hydraulic jar device |
Mar. 5, 1996 |
| 5411107 |
Coil tubing hydraulic jar device |
May. 2, 1995 |
| 5318139 |
Reduced waiting time hydraulic drilling jar |
Jun. 7, 1994 |
| 5232060 |
Double-acting accelerator for use with hydraulic drilling jars |
Aug. 3, 1993 |
| 5228516 |
Tester valve |
Jul. 20, 1993 |
| 5215148 |
Subsurface well pressure actuated and fired apparatus |
Jun. 1, 1993 |
| 5190114 |
Flow pulsing apparatus for drill string |
Mar. 2, 1993 |
| 5174393 |
Hydraulic jar |
Dec. 29, 1992 |
| 5123493 |
Valve used in a hydraulic drilling jar |
Jun. 23, 1992 |
| 5086853 |
Large bore hydraulic drilling jar |
Feb. 11, 1992 |
| 5056608 |
Boring ram |
Oct. 15, 1991 |
| 5052485 |
Jar mechanism |
Oct. 1, 1991 |
| 5033557 |
Hydraulic drilling jar |
Jul. 23, 1991 |
| 5009272 |
Flow pulsing method and apparatus for drill string |
Apr. 23, 1991 |
| 5007479 |
Hydraulic up-down well jar and method of operating same |
Apr. 16, 1991 |
| 4964477 |
Pneumatic percussive device |
Oct. 23, 1990 |
| 4865125 |
Hydraulic jar mechanism |
Sep. 12, 1989 |
| 4846273 |
Jar mechanism accelerator |
Jul. 11, 1989 |
| 4658917 |
Enclosed jar tool |
Apr. 21, 1987 |
| 4582148 |
Mechano-hydraulic double-acting drilling jar |
Apr. 15, 1986 |
| 4566546 |
Single acting hydraulic fishing jar |
Jan. 28, 1986 |
| 4550789 |
Hydraulic jarring tool |
Nov. 5, 1985 |
| 4545444 |
Jar mechanism energizer |
Oct. 8, 1985 |
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