| Patents for E21C 37 - Other methods or devices for dislodging with or without loading (1,249) |
|---|
| 02/20/1979 | US4140347 Fluid operated wall groove cutter |
| 12/12/1978 | US4129335 Fluid jet method and device for breaking hard material |
| 10/31/1978 | US4123108 Method and device for breaking a hard compact material |
| 09/26/1978 | US4116273 Induction heating of coal in situ |
| 09/19/1978 | US4114951 Hydraulically actuated tool for mechanically splitting rock-like material |
| 09/19/1978 | US4114950 Method and apparatus for breaking a hard compact material such as rock or concrete |
| 08/29/1978 | CA1037253A1 Impact or demolition tool |
| 08/01/1978 | US4103971 Method for breaking rock by directing high velocity jet into pre-drilled bore |
| 07/11/1978 | US4099784 Method and apparatus for breaking hard compact material such as rock |
| 07/04/1978 | CA1034111A1 Hammer drills |
| 06/13/1978 | US4094365 Electrohydraulically operated portable power tool |
| 05/16/1978 | US4089562 Cutter for asphalt paving |
| 05/16/1978 | US4089380 Hammer having fluid biased work member |
| 05/09/1978 | US4088368 Method for explosive breaking of hard compact material |
| 02/28/1978 | US4076082 Thermal drilling device |
| 02/21/1978 | US4074629 Blasting agent and method |
| 02/07/1978 | US4072353 Thrust-impact rock-splitter |
| 01/31/1978 | US4071095 Methods of and apparatus for winning reef |
| 01/31/1978 | US4070948 Pneumatic impact devices |
| 12/13/1977 | US4062268 Fluid operable hammer |
| 11/22/1977 | US4059279 Hollow percussion drill rod with seal for cleaning fluid inlet tube |
| 10/11/1977 | US4053182 Mining method and apparatus |
| 09/27/1977 | US4050740 Method of and apparatus for melting block sulphur |
| 08/16/1977 | US4042280 Method of breaking up objects |
| 08/09/1977 | US4040584 Mounting arrangements for mineral displacing tools |
| 07/12/1977 | US4034816 Demolition tool |
| 05/31/1977 | US4026602 Apparatus for mechanically breaking up stone or reinforced concrete |
| 05/24/1977 | US4025116 Method of operating a constant depth linear cutting head on a retrofitted continuous mining machine |
| 04/26/1977 | US4020317 Method of mining rock with an electron beam |
| 04/12/1977 | US4017121 Longwall mining of trona with prefracturing to prevent slabbing |
| 02/01/1977 | US4005906 Impact or demolition tool |
| 01/11/1977 | US4002119 Method for in situ assembly of charge for controlled shooting of wells |
| 01/11/1977 | US4002079 Breathing protector boot for impactor tools |
| 12/28/1976 | US3999805 Articulated support |
| 12/07/1976 | US3995906 Rock-splitting apparatus |
| 12/07/1976 | US3995703 Electrohydraulically operated portable power tool |
| 10/26/1976 | US3988037 Method of breaking a hard compact material, means for carrying out the method and application of the method |
| 10/26/1976 | US3988036 Electric induction heating of underground ore deposits |
| 06/15/1976 | US3963275 Method of breaking free-standing rock boulders |
| 06/08/1976 | US3961565 Piston and cylinder assembly |
| 06/01/1976 | US3960407 Cutters and methods of cutting |
| 06/01/1976 | US3960082 Down-the-hole device for breaking rock, concrete and reinforced concrete by pulsewize high liquid pressure |
| 05/18/1976 | US3957309 Apparatus for mechanically breaking up rock |
| 05/18/1976 | US3957308 Method of removing tar sands from subterranean formations |
| 04/20/1976 | US3951065 Explosive device and method for removing ice from railroad tunnels |
| 04/06/1976 | US3948176 Mechanical initiator for detonation of explosives |
| 03/09/1976 | US3942322 Device in hydraulic percussion tools |
| 03/02/1976 | US3941101 Impact action mechanism |
| 02/24/1976 | US3940151 Glands |