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Class Information
Number: 175/302
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 > Condition for release adjustable
Description: Apparatus in which the holding means is adjustable to vary the manner in which the holding means may be released or the force required to effect release of the holding means.

Sub-classes under this class:

Class Number Class Name Patents
175/303 Adjustable below ground 4

Patents under this class:

Patent Number Title Of Patent Date Issued
7533724 Downhole intelligent impact jar and method for use May. 19, 2009
6948560 Jar for use in a downhole toolstring Sep. 27, 2005
5022473 Adjustable fishing jar Jun. 11, 1991
4844157 Jar accelerator Jul. 4, 1989
4553614 Compensation device for insertion in a drill string for deep-well drilling tools Nov. 19, 1985
4463815 Mechanical jarring tool Aug. 7, 1984
4333542 Downhole fishing jar mechanism Jun. 8, 1982
4304428 Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint Dec. 8, 1981
4186807 Optional up-blow, down-blow jar tool Feb. 5, 1980
4105082 Jarring tool Aug. 8, 1978
4036312 Well jar Jul. 19, 1977

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