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Class Information
Number: 175/300
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
Description: Apparatus in which means are provided on one of the telescoping members for engaging and holding the other member against axial movement with said reciprocation limiting means in spaced relation, said holding means being selectively releasable to allow relative axial movement between the members.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7325631 |
Mill and pump-off sub |
Feb. 5, 2008 |
| 7299885 |
Downhole drill string having a collapsible subassembly and method of loosening a stuck drillstring |
Nov. 27, 2007 |
| 6827162 |
Self-retaining downhole-hammer drill bit |
Dec. 7, 2004 |
| 6810974 |
Quick release drill bit for down-hole drills |
Nov. 2, 2004 |
| 6789632 |
Rock drilling apparatus |
Sep. 14, 2004 |
| 6698537 |
Bit retention system |
Mar. 2, 2004 |
| 6516903 |
Drill bit stabilizer device |
Feb. 11, 2003 |
| 6308940 |
Rotary and longitudinal shock absorber for drilling |
Oct. 30, 2001 |
| 6182776 |
Overburden drilling apparatus having a down-the-hole hammer separatable from an outer casing/drill bit unit |
Feb. 6, 2001 |
| 6070678 |
Bit retention system |
Jun. 6, 2000 |
| 5647447 |
Bit retention device for a bit and chuck assembly of a down-the-hole percussive drill |
Jul. 15, 1997 |
| 5425430 |
Jar enhancer |
Jun. 20, 1995 |
| 5318139 |
Reduced waiting time hydraulic drilling jar |
Jun. 7, 1994 |
| 5086853 |
Large bore hydraulic drilling jar |
Feb. 11, 1992 |
| 4903785 |
Drilling and chiseling tool bit |
Feb. 27, 1990 |
| 4846273 |
Jar mechanism accelerator |
Jul. 11, 1989 |
| 4694917 |
Mechanical jarring devices for use in drilling |
Sep. 22, 1987 |
| 4662460 |
Rotary drilling jar |
May. 5, 1987 |
| 4607692 |
Wireline jar |
Aug. 26, 1986 |
| 4582148 |
Mechano-hydraulic double-acting drilling jar |
Apr. 15, 1986 |
| 4558976 |
Quick fix drill wrench |
Dec. 17, 1985 |
| 4545444 |
Jar mechanism energizer |
Oct. 8, 1985 |
| 4462471 |
Bidirectional fluid operated vibratory jar |
Jul. 31, 1984 |
| 4401161 |
Oil well tool retrieving device |
Aug. 30, 1983 |
| 4186807 |
Optional up-blow, down-blow jar tool |
Feb. 5, 1980 |
| 4142597 |
Mechanical detent jars |
Mar. 6, 1979 |
| 4113038 |
Drilling jar |
Sep. 12, 1978 |
| 4004643 |
Mechanical drilling jar |
Jan. 25, 1977 |
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