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