Patents for E21B 11 - Other drilling tools (454)
01/1990
01/17/1990EP0350581A2 Elongate body
12/1989
12/05/1989US4884638 Soil coring device with a core ejector mechanism
11/1989
11/08/1989EP0340280A1 Self-propelled subsoil penetrating tool system
09/1989
09/26/1989CA1259982A1 Combination soil auger and soil core sampler with sample retaining capacity
09/13/1989EP0331913A2 Boring ram with a turn-and-pull reversing device
08/1989
08/22/1989US4858703 Self-propelled subsoil penetrating tool system
06/1989
06/27/1989US4842207 Device for detecting and measuring the tension on a cable
06/20/1989US4840234 Pneumatic ram boring machine
05/1989
05/18/1989WO1989004418A1 Self-propelled subsoil penetrating tool system
04/1989
04/11/1989US4819744 Funnel hole ice auger
04/04/1989US4817735 Foot powered ice auger
12/1988
12/13/1988US4790392 Soil sample core extraction tool
06/1988
06/29/1988CN87214938U Explosive-falling drill tool without drawing bit
04/1988
04/13/1988EP0263281A1 Pneumatic boring ram
04/12/1988US4736804 Overhead drill jig
03/1988
03/15/1988CA1234167A1 Earth boring apparatus
01/1988
01/06/1988CN86104172A Reverse cycle continuous centrodrilling impactor and capper
10/1987
10/21/1987EP0241750A2 Combination soil auger and soil core sampler with sample retaining capacity
10/08/1987DE3615068C1 Rope-guided trench-wall grab
03/1987
03/31/1987US4653336 Combination soil auger and soil core sampler with sample retaining capacity
10/1986
10/14/1986US4616720 Divided-bucket type rotary excavator
06/1986
06/25/1986CN85200364U Pneumatic boring grab for drilling
05/1986
05/20/1986US4589502 Earth boring apparatus
12/1985
12/04/1985EP0162981A1 Divided-bucket type rotary excavator
12/03/1985US4556114 Soil sampler device
10/1985
10/29/1985US4549612 Soil sampler
09/1985
09/03/1985CA1192900A1 Detachable shoe plates for large diameter drill bits
04/1985
04/02/1985US4508181 Driving head for pneumatic pile drivers
02/1985
02/12/1985US4498547 Earth soil sampler
12/1984
12/18/1984US4488605 Drill assembly for forming a hole
12/04/1984US4485570 Apparatus for mounting a drilling machine on an excavator bucket
08/1984
08/21/1984US4466498 Detachable shoe plates for large diameter drill bits
08/07/1984US4463815 Mechanical jarring tool
08/01/1984EP0114584A2 Chain cutter excavator
04/1984
04/17/1984US4442721 Moisture and consistency soil sampler
07/1983
07/26/1983US4394882 Continuous chain bit with downhole cycling capability
06/1983
06/14/1983US4387483 Extracting handle for earth drill augers
05/1983
05/17/1983US4383583 Soil sampling tool
11/1982
11/16/1982US4359110 Variable-length sampling device
10/1981
10/27/1981US4296823 Cable tool with circulating drill stem
04/1981
04/28/1981US4263975 Device for high-speed boring of stepped post-holes
02/1981
02/24/1981US4252200 Sampling device
12/1980
12/30/1980US4241795 Hand powered high impact tool
03/1980
03/25/1980US4194311 Grave digging apparatus
03/18/1980US4193459 Post-hole driver
01/1980
01/09/1980EP0006786A1 Device for boring a stepped hole for receiving a post or the like
03/1979
03/27/1979US4146098 Masonry cutting tool
11/1978
11/14/1978CA1042417A1 Bit adjacent stabilizer and steel
10/1978
10/31/1978US4122905 Hand auger
09/1978
09/26/1978US4116284 Earth drills
08/1977
08/16/1977US4042270 Post hole digger
06/1977
06/28/1977US4031973 Placer mining tool
06/1976
06/29/1976US3965999 Drilling grab for pile foundations and well boreholes
02/1976
02/17/1976US3938598 Belling apparatus
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