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Class Information
Number: 175/304
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > With releasable means to detachably retain telescoping members against axial reciprocation > Resiliently biased latch
Description: Apparatus in which said holding means is held in operative position by means of an elastic element.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7510008 |
Method and apparatus for decreasing drag force of trigger mechanism |
Mar. 31, 2009 |
| 7311149 |
Jar with adjustable preload |
Dec. 25, 2007 |
| 7299872 |
Hydraulic-mechanical jar tool |
Nov. 27, 2007 |
| 7293614 |
Multiple impact jar assembly and method |
Nov. 13, 2007 |
| 7290604 |
Downhole tool with pressure balancing |
Nov. 6, 2007 |
| 7066251 |
Hydraulic jar lock |
Jun. 27, 2006 |
| 6948560 |
Jar for use in a downhole toolstring |
Sep. 27, 2005 |
| 6705415 |
Directional drilling apparatus |
Mar. 16, 2004 |
| 6338387 |
Downward energized motion jars |
Jan. 15, 2002 |
| 5669458 |
Rotary jar |
Sep. 23, 1997 |
| 5327982 |
Drill string jar apparatus |
Jul. 12, 1994 |
| 5103903 |
Jar |
Apr. 14, 1992 |
| 5022473 |
Adjustable fishing jar |
Jun. 11, 1991 |
| 4889198 |
Drilling jar latch |
Dec. 26, 1989 |
| 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 |
| 4646830 |
Mechanical jar |
Mar. 3, 1987 |
| 4629009 |
Method and apparatus for firing borehole perforating apparatus |
Dec. 16, 1986 |
| 4582148 |
Mechano-hydraulic double-acting drilling jar |
Apr. 15, 1986 |
| 4394883 |
Well jar |
Jul. 26, 1983 |
| 4376468 |
Drilling jar |
Mar. 15, 1983 |
| 4186807 |
Optional up-blow, down-blow jar tool |
Feb. 5, 1980 |
| 4142597 |
Mechanical detent jars |
Mar. 6, 1979 |
| 4130169 |
Downhole connector for use with drill string telemetering system |
Dec. 19, 1978 |
| 4109736 |
Double acting jar |
Aug. 29, 1978 |
| 4036312 |
Well jar |
Jul. 19, 1977 |
| 4023630 |
Well jar having a time delay section |
May. 17, 1977 |
| 3963081 |
Double acting mechanical jar |
Jun. 15, 1976 |
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