| Patents for E21C 41 - Methods of underground or surface mining; Layouts therefor (2,789) |
|---|
| 12/26/1978 | US4131416 Slurry backfilling of in situ oil shale retort |
| 12/19/1978 | CA1044709A1 Method of recovering useful minerals from subterranean deposits thereof |
| 12/19/1978 | CA1044708A1 Method for mining of rock or ore according to the block caving principle in massive formations |
| 11/28/1978 | US4127303 Coal mining method at a long-walled pit face of the coal mine |
| 11/21/1978 | CA1042783A1 In situ recovery of constituents from ore deposits |
| 10/31/1978 | US4123109 Mining method |
| 10/17/1978 | US4120355 Method for providing fluid communication for in situ shale retort |
| 10/10/1978 | US4119349 Underground oil-water separator |
| 10/10/1978 | US4119345 In situ oil shale retorting process using introduction of gas at an intermediate location |
| 10/03/1978 | US4118070 Subterranean in situ oil shale retort and method for making and operating same |
| 09/12/1978 | CA1038411A1 Method for mining oil shales, tar sands and other minerals |
| 08/15/1978 | US4106575 Tool string and means for supporting and rotating the same |
| 08/01/1978 | US4103972 Open pit mine |
| 07/25/1978 | US4102397 Sealing an underground coal deposit for in situ production |
| 07/18/1978 | US4101172 In-situ methods of extracting bitumen values from oil-sand deposits |
| 07/11/1978 | US4099783 Method for thermoshaft oil production |
| 06/20/1978 | US4095845 Method of and apparatus for the mining of coal |
| 06/13/1978 | US4094549 Process for hydraulically mining coal employing a cutting monitor and a breaking monitor |
| 06/06/1978 | US4093310 Sealing an underground coal deposit for in situ production |
| 05/30/1978 | US4092052 Converting underground coal fires into commercial products |
| 05/02/1978 | US4087131 Drag bit excavation |
| 04/25/1978 | US4085971 Energy conserving mining system and method |
| 04/18/1978 | US4084384 Advanced slot stress control method of underground excavation |
| 04/04/1978 | US4081968 Mining oil shale and backfilling with mechanically compressed spent shale |
| 03/21/1978 | US4079999 Method and apparatus for mining |
| 03/07/1978 | US4077671 Subterranean drilling and slurry mining method |
| 03/07/1978 | US4077481 Subterranean mining apparatus |
| 02/28/1978 | US4076312 Method and apparatus for retorting oil shale at subatmospheric pressure |
| 02/28/1978 | US4076311 Hydraulic mining from tunnel by reciprocated pipes |
| 02/21/1978 | US4074920 Mining apparatus and method for an augered seam |
| 02/07/1978 | US4072352 Method for mining of rock or ore according to the block caving principle in massive formations |
| 02/07/1978 | US4072351 Radial mining method |
| 02/07/1978 | US4072350 Multi-stage method of operating an in situ oil shale retort |
| 02/07/1978 | US4072018 Tunnel support structure and method |
| 01/10/1978 | US4067617 Subterranean drilling and slurry mining |
| 01/10/1978 | US4067616 Recovering bitumen with fluorochlorocarbon solvent |
| 12/27/1977 | US4065183 Recovery system for oil shale deposits |
| 12/13/1977 | US4062595 Automatic face transfer linear cutting rotary head continuous mining machine and method |
| 12/06/1977 | US4061399 Mining by insertion of cutting modules into shaft for connection and actuation |
| 11/29/1977 | US4059963 Method of mine backfilling and material therefor |
| 11/22/1977 | US4059309 Apparatus and method for cutting elongated slots in earth formations |
| 11/22/1977 | US4059308 Pressure swing recovery system for oil shale deposits |
| 11/22/1977 | US4059166 Subterranean drilling and slurry mining |
| 11/08/1977 | US4056939 Inflatable envelope systems for use in excavations |
| 10/11/1977 | US4053182 Mining method and apparatus |
| 09/27/1977 | US4050740 Method of and apparatus for melting block sulphur |
| 08/30/1977 | US4045085 Fracturing of pillars for enhancing recovery of oil from in situ oil shale retort |
| 08/23/1977 | US4043596 Forming shale oil recovery retort by blasting into slot-shaped columner void |
| 08/16/1977 | US4042485 Combuston method of oil shale retorting |
| 07/12/1977 | US4035023 Apparatus and process for hydraulic mining |
| 06/28/1977 | US4032195 Push-pull mining system |
| 06/21/1977 | US4030752 Longwall mining of thick underground mineral seams |
| 06/14/1977 | US4029361 Longwall mining roof support for double deck machines |
| 06/14/1977 | US4029360 Method of recovering oil and water from in situ oil shale retort flue gas |
| 06/07/1977 | US4027731 Methods of and apparatus for hydrocarbon recovery |
| 05/24/1977 | US4025119 Method and apparatus for strip mining |
| 05/24/1977 | US4025115 Method of enhancing recovery of oil from pillars adjacent in situ oil shaft retort |
| 05/17/1977 | US4023862 Hydraulic mining and transportation of coal using hot oil under pressure |
| 05/10/1977 | US4022511 Recovery of liquid and gaseous products from an in situ oil shale retort |
| 05/03/1977 | US4021075 Excavators |
| 04/12/1977 | US4017122 Longwall trench mining system |
| 04/12/1977 | US4017121 Longwall mining of trona with prefracturing to prevent slabbing |
| 04/12/1977 | US4017119 Method for rubblizing an oil shale deposit for in situ retorting |
| 03/29/1977 | US4014575 System for fuel and products of oil shale retort |
| 03/22/1977 | US4013320 Hook plough apparatus for longwall mining |
| 02/15/1977 | US4007966 Single-entry mining development system |
| 02/15/1977 | US4007965 Method of recovering useful minerals from subterranean deposits thereof |
| 12/28/1976 | US3999804 Longwall mining with chain pillar recovery |
| 12/21/1976 | US3998492 Method for selectively extracting magnesium chloride hexahydrate from magnesium chloride hexahydrate bearing materials in situ by solution mining |
| 12/21/1976 | US3998061 Formation of cavities in the bed of a sheet of water |
| 11/23/1976 | US3993354 Multi-level hydraulic mining system |
| 11/23/1976 | US3993146 Apparatus for mining coal using vertical bore hole and fluid |
| 09/14/1976 | US3980340 Method for longwall mining with side-by-side arch sections |
| 09/07/1976 | US3979731 Method of and system for rationalizing the operation of open-pit mines |
| 08/31/1976 | USRE28945 Method and apparatus for excavating settled body of solids |
| 08/17/1976 | US3975056 Longwall canted drum mining machine |
| 08/17/1976 | US3975053 Mining methods as such and combined with equipment |
| 06/22/1976 | US3964265 Method and apparatus for mining and supporting the mine roof |
| 06/01/1976 | US3960408 Tunnel layout for longwall mining using shields |
| 05/25/1976 | US3958830 Longwall mining system and archshield for mining tar sands, oil shales and the like |
| 05/18/1976 | US3957308 Method of removing tar sands from subterranean formations |
| 05/18/1976 | US3957305 In situ values extraction |
| 04/20/1976 | US3951459 Coal mining apparatus and method |
| 04/20/1976 | US3951457 Hydraulic mining technique for recovering bitumen from tar sand deposit |
| 04/13/1976 | US3950029 In situ retorting of oil shale |
| 03/09/1976 | US3942841 Slurry handling system |
| 03/02/1976 | US3941423 Method of and apparatus for extracting oil from oil shale |
| 02/10/1976 | US3937520 In situ mining using bacteria |
| 02/10/1976 | US3937025 Inflatable envelope systems for use in excavations |