Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 11 - Other drilling tools
Patents for E21B 11 - Other drilling tools (454)
07/1997
07/16/1997CN1154731A Device and method for making a slot in an underground formation
06/1997
06/04/1997EP0689636B1 Clamshell grab for drilling cylindrical holes
05/1997
05/21/1997EP0774039A1 Device and method for making a slot in an underground formation
05/15/1997WO1997017523A1 Apparatus for forming a slot in a wellbore
03/1997
03/12/1997EP0760710A1 Apparatus for lifting and dropping a drop hammer
02/1997
02/12/1997CN1142567A Diameter changeable expanding drill bit for full casing wall-protection drill
11/1996
11/20/1996CN1136126A Borehole boring method and machine
11/06/1996EP0741227A2 Borehole boring method and machine
10/1996
10/02/1996CN2236541Y Drilling tool
09/1996
09/24/1996US5558285 Apparatus for lifting and dropping a drop hammer
09/24/1996US5558167 Percussion boring machine
08/1996
08/14/1996EP0560867B1 Method for manufacturing a tubular foundation in the ground
07/1996
07/23/1996US5538090 Ground probe apparatus
07/16/1996US5535836 Total recovery drill
05/1996
05/29/1996CN2228117Y Built-in safe and erecting tool theroof
05/21/1996US5517868 Method for obtaining a soil sample
05/01/1996CN1121555A Tool for transporting cutting means to and from a ground drill
05/01/1996CN1121554A Insert for releasably retaining cutting means in a ground drill
05/01/1996CN1121552A Drive sub
04/1996
04/09/1996US5505098 Cartridge for preserving a soil sample
04/03/1996CN1119884A Clamshell grab for drilling cylindrical holes
03/1996
03/26/1996US5501283 Hole cutting device for recovering targets located with a metal detector
03/20/1996EP0701466A1 A hole-making device
03/20/1996CN2222793Y Large desert shallow hole drilling tool for petroleum geophysical prospecting
03/12/1996US5497714 Planting hole digger
02/1996
02/15/1996WO1996004457A1 Device and method for making a slot in an underground formation
01/1996
01/30/1996US5487432 Soil penetration tool
01/03/1996EP0689636A1 Clamshell grab for drilling cylindrical holes
12/1995
12/26/1995US5478128 Clamshell action post hole digger
11/1995
11/23/1995WO1995031707A1 Method and cartridge for obtaining soil samples
10/1995
10/31/1995US5462126 Ground rod driver
10/03/1995US5454435 Device for facilitating insertion of a beach umbrella in sand
08/1995
08/03/1995WO1995020309A1 Digging tool
08/03/1995CA2179182A1 Digging tool
07/1995
07/11/1995US5431238 Drilling tool for use in constructing large diameter piles, ventilating shafts and other similar mining works
06/1995
06/27/1995US5427424 Single handle post hole digger
06/27/1995US5427189 For making small diameter holes in the earth
05/1995
05/30/1995US5419211 Device for taking soil samples
05/09/1995CA2029733C Reamer
05/02/1995US5411103 Moisture and soil consistency probe
04/1995
04/25/1995US5408893 Ground moisture probe
02/1995
02/14/1995US5388654 Ground-boring device
01/1995
01/26/1995DE4324956A1 Drilling grab
01/18/1995CN1097391A Anchor with deoperable screw
12/1994
12/14/1994EP0628700A2 A drilling tool for use in constructing large diameter boreholes
12/08/1994WO1994027687A1 A hole-making device
12/08/1994CA2164112A1 A hole-making device
11/1994
11/10/1994WO1994024841A1 Post hole digger
10/1994
10/25/1994US5358062 Portable handheld drilling apparatus
10/12/1994CN2179453Y Vibrating hammer with hidden holes
09/1994
09/29/1994WO1994021884A1 Clamshell grab for drilling cylindrical holes
09/06/1994US5343771 Tool for sampling soil containing volatile organic compound
07/1994
07/27/1994EP0607470A1 Automatic evacuation drilling bucket
07/07/1994WO1994014539A1 Apparatus for lifting and dropping a drop hammer
06/1994
06/14/1994US5320363 Post hole digger
06/09/1994WO1994012763A1 Anchor with deoperable screw
04/1994
04/06/1994EP0590335A1 Boring ram
02/1994
02/03/1994DE4323126A1 Hand operated mechanical auger - has release lever associated with brake to disengage drive when auger strikes object
01/1994
01/19/1994EP0578942A1 Boring ram
01/04/1994US5275245 Device to facilitate creating foxholes with explosives and method of making the same
12/1993
12/28/1993US5273331 Post hole digger
12/15/1993CN2149472Y Threaded rod drilling tool
10/1993
10/06/1993EP0457791B1 Device for taking soil samples
09/1993
09/29/1993EP0562429A1 Earth boring apparatus
09/25/1993CA2091609A1 Ground-boring device
09/22/1993EP0560867A1 Tool for making holes in the ground.
09/01/1993CN2141457Y Threaded rod power drill set
08/1993
08/31/1993US5240353 Anchor with deoperable screw
08/10/1993US5234062 Automatic evacuation drilling bucket
05/1993
05/11/1993US5209534 Take-apart post hole digging tool
04/1993
04/20/1993US5203824 Method and apparatus for preparing the surface of a region of soil for further testing
03/1993
03/31/1993EP0534715A1 Method and apparatus for preparing the surface of a region of soil for further testing
03/24/1993CA2078834A1 Method and apparatus for preparing the surface of a region of soil for further testing
03/02/1993US5190113 Reamer
02/1993
02/16/1993US5186436 Electric fence pole installation apparatus
12/1992
12/16/1992CN2124995U Hanging type turbine drilling tool with independent supporting joint
12/10/1992WO1992010637A3 Tool for making holes in the ground
10/1992
10/21/1992EP0340280A4 Self-propelled subsoil penetrating tool system
09/1992
09/22/1992US5148878 Ram boring machine
06/1992
06/30/1992US5125462 Quick-change ram boring head
06/25/1992WO1992010637A2 Tool for making holes in the ground
05/1992
05/27/1992CN2105554U Screw drill transmission shaft assemblage apparatus
12/1991
12/24/1991US5074364 Ram boring machine
11/1991
11/27/1991EP0457791A1 Device for taking soil samples.
11/14/1991DE4018735A1 Soil specimen extraction arrangement - has hollow tube mounted on jib attached to rail linked to tractor hydraulic mechanism
08/1991
08/13/1991US5038870 Ice auger cutter
07/1991
07/09/1991US5029651 Post driver
05/1991
05/23/1991DE4000677A1 Geraet zur entnahme von bodenproben Geraet to earth sample
04/1991
04/16/1991US5007492 Safety stabilizer for auger
02/1991
02/13/1991EP0412477A1 Grab bucket provided with anchoring means to the trench wall
12/1990
12/04/1990US4974682 For use on golf course greens
09/1990
09/26/1990EP0388627A1 Drop-hammer
09/20/1990WO1990010372A1 Improvements in or relating to tools
09/04/1990US4953626 Ram boring machine having a pull-and-turn reversing gear
08/1990
08/23/1990WO1990009508A1 Device for taking soil samples
08/16/1990DE3904105A1 Method and device for taking soil samples
07/1990
07/11/1990EP0377153A2 Boring ram
06/1990
06/13/1990EP0372225A2 Boring ram
04/1990
04/11/1990EP0362481A2 Boring ram
03/1990
03/06/1990US4905773 Self-propelled subsoil penetrating tool system
1 2 3 4 5