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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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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