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Class Information
Number: 175/305
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Telescoping members relatively rotatable
Description: Apparatus in which the telescoping members are so arranged that they may freely rotate relative to each other.

Sub-classes under this class:

Class Number Class Name Patents
175/306 With means to couple members to prevent relative rotation 32

Patents under this class:

Patent Number Title Of Patent Date Issued
8657007 Hydraulic jar with low reset force Feb. 25, 2014
8511403 Steerable ground piercing tools Aug. 20, 2013
8256539 Steerable ground piercing tools Sep. 4, 2012
7748446 Seismic source and method of generating a seismic wave in a formation Jul. 6, 2010
7299885 Downhole drill string having a collapsible subassembly and method of loosening a stuck drillstring Nov. 27, 2007
7093677 Percussion drill head Aug. 22, 2006
7090038 Bedrock drilling and excavating apparatus Aug. 15, 2006
7044240 Torque absorber for downhole drill motor May. 16, 2006
6942046 Bore bit for very hard material Sep. 13, 2005
6722454 Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes Apr. 20, 2004
6659202 Steerable fluid hammer Dec. 9, 2003
6557653 Working tool for a percussion power tool May. 6, 2003
6488105 Method and apparatus for subsurface exploration Dec. 3, 2002
6164393 Impact tool Dec. 26, 2000
5918690 Bottom rotation shaft actuator Jul. 6, 1999
5881827 Extendable bit Mar. 16, 1999
5156223 Fluid operated vibratory jar with rotating bit Oct. 20, 1992
4958691 Fluid operated vibratory jar with rotating bit Sep. 25, 1990
4715454 Mechanical directional drilling jar with swivel means Dec. 29, 1987
4688649 Mechanical drill string jar Aug. 25, 1987
4662460 Rotary drilling jar May. 5, 1987
4621698 Percussion boring tool Nov. 11, 1986
4415047 Downhole case driving apparatus for impact drills Nov. 15, 1983

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