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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
8322463 Down hole multiple piston tools operated by pulse generation tools and methods for drilling Dec. 4, 2012
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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