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Class Information
Number: 175/299
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Resiliently biased
Description: Apparatus in which an elastic member acts upon the hammer or impact device to urge said hammer or impact device toward or away from a jarring position.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7281575 |
Field adjustable impact jar |
Oct. 16, 2007 |
| 7163058 |
Hydraulic jar device |
Jan. 16, 2007 |
| 7111678 |
Field adjustable impact jar |
Sep. 26, 2006 |
| 7093677 |
Percussion drill head |
Aug. 22, 2006 |
| 7044240 |
Torque absorber for downhole drill motor |
May. 16, 2006 |
| 6951439 |
Dust collection unit |
Oct. 4, 2005 |
| 6896060 |
Downhole jarring tool adjuster |
May. 24, 2005 |
| 6745836 |
Down hole motor assembly and associated method for providing radial energy |
Jun. 8, 2004 |
| 6736223 |
Thrust control apparatus |
May. 18, 2004 |
| 6571870 |
Method and apparatus to vibrate a downhole component |
Jun. 3, 2003 |
| 6338387 |
Downward energized motion jars |
Jan. 15, 2002 |
| 6328101 |
Impact enhancing tool |
Dec. 11, 2001 |
| 6283229 |
Impact device for directional boring |
Sep. 4, 2001 |
| 6062324 |
Fluid operated vibratory oil well drilling tool |
May. 16, 2000 |
| 6035954 |
Fluid operated vibratory oil well drilling tool with anti-chatter switch |
Mar. 14, 2000 |
| 5875842 |
Multi-impact jarring apparatus and method for using same |
Mar. 2, 1999 |
| 5850884 |
Moling apparatus |
Dec. 22, 1998 |
| 5833541 |
Elastomeric joints having interlocking threaded portions |
Nov. 10, 1998 |
| 5669458 |
Rotary jar |
Sep. 23, 1997 |
| 5624001 |
Mechanical-hydraulic double-acting drilling jar |
Apr. 29, 1997 |
| 5503228 |
Jar apparatus and method of jarring |
Apr. 2, 1996 |
| 5425430 |
Jar enhancer |
Jun. 20, 1995 |
| 5330018 |
Auto set bi-directional jar |
Jul. 19, 1994 |
| 5318139 |
Reduced waiting time hydraulic drilling jar |
Jun. 7, 1994 |
| 5267613 |
Upstroke jar |
Dec. 7, 1993 |
| 5217070 |
Drill string jarring and bumping tool |
Jun. 8, 1993 |
| 5139086 |
Double acting accelerator jar |
Aug. 18, 1992 |
| 5052485 |
Jar mechanism |
Oct. 1, 1991 |
| 5022473 |
Adjustable fishing jar |
Jun. 11, 1991 |
| 5022474 |
Multiple blow percussion drill assembly with rapid field maintenance and adjustment capability |
Jun. 11, 1991 |
| 4919219 |
Remotely adjustable fishing jar |
Apr. 24, 1990 |
| 4865125 |
Hydraulic jar mechanism |
Sep. 12, 1989 |
| 4848454 |
Downhole tool for use with a ball and seat traveling valve for a fluid pump |
Jul. 18, 1989 |
| 4846273 |
Jar mechanism accelerator |
Jul. 11, 1989 |
| 4844183 |
Accelerator for fishing jar with hydrostatic assist |
Jul. 4, 1989 |
| 4844157 |
Jar accelerator |
Jul. 4, 1989 |
| 4727944 |
Percussion drill string assembly |
Mar. 1, 1988 |
| 4715454 |
Mechanical directional drilling jar with swivel means |
Dec. 29, 1987 |
| 4694917 |
Mechanical jarring devices for use in drilling |
Sep. 22, 1987 |
| 4688649 |
Mechanical drill string jar |
Aug. 25, 1987 |
| 4665998 |
Mechanical well jar |
May. 19, 1987 |
| 4658917 |
Enclosed jar tool |
Apr. 21, 1987 |
| 4646830 |
Mechanical jar |
Mar. 3, 1987 |
| 4629009 |
Method and apparatus for firing borehole perforating apparatus |
Dec. 16, 1986 |
| 4607692 |
Wireline jar |
Aug. 26, 1986 |
| 4512424 |
Tubular spring slip-joint and jar |
Apr. 23, 1985 |
| 4498548 |
Well jar incorporating elongate resilient vibration snubbers and mounting apparatus therefor |
Feb. 12, 1985 |
| 4494615 |
Jarring tool |
Jan. 22, 1985 |
| 4478284 |
Jar tool |
Oct. 23, 1984 |
| 4462471 |
Bidirectional fluid operated vibratory jar |
Jul. 31, 1984 |
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