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