| Patents for E21C 41 - Methods of underground or surface mining; Layouts therefor (2,789) |
|---|
| 11/18/1980 | US4234230 In situ processing of mined oil shale |
| 11/18/1980 | CA1089883A1 Method of mining flat-dipping and sloping beds of a mineral with hydraulic excavation |
| 11/12/1980 | EP0018582A1 Process for underground gasification of coal |
| 11/11/1980 | US4232904 Method and apparatus for deep mining using chain driven in fixed direction |
| 11/04/1980 | US4231617 Consolidation of in-situ retort |
| 10/28/1980 | US4230368 Method for displacing large blocks of earth |
| 10/28/1980 | US4230367 Explosive fragmentation, retorting in situ |
| 10/21/1980 | US4228856 Process for recovering viscous, combustible material |
| 10/14/1980 | US4227743 Method of thermal-mine recovery of oil and fluent bitumens |
| 10/14/1980 | CA1087518A1 Gas withdrawal from an in situ oil shale retort |
| 10/07/1980 | US4226475 Underground mineral extraction |
| 09/23/1980 | US4223726 Determining the locus of a processing zone in an oil shale retort by effluent water composition |
| 09/16/1980 | US4222612 Method of mining flat-dipping and sloping beds of a mineral with hydraulic excavation |
| 09/04/1980 | WO1980001837A1 Process for sorting coarse-to-fine material according to the chemical composition thereof |
| 09/02/1980 | US4220203 Method for recovering coal in situ |
| 08/26/1980 | US4219237 Method for maximizing shale oil recovery from an underground formation |
| 08/12/1980 | US4216998 Method of underground mining by pillar extraction |
| 07/22/1980 | US4213653 Method of mining of thick seam materials |
| 07/15/1980 | CA1081719A1 Method and apparatus for a combined hydraulic- mechanical recovery of extremely hard mineral raw material |
| 07/15/1980 | CA1081606A1 Process for determining the location and/or extent of rock cavities, especially of artificially generated rock cracks |
| 07/08/1980 | CA1081266A1 Method for the segmented mining and drying of bentonite |
| 07/01/1980 | US4210366 Method of detonating explosives for fragmenting oil shale formation toward a vertical free face |
| 07/01/1980 | CA1080757A1 Automatic face transfer linear cutting rotary head continuous mining machine |
| 06/17/1980 | CA1079757A1 Method of mining potash ores and the like |
| 06/17/1980 | CA1079756A1 Mining method and apparatus |
| 06/03/1980 | CA1078882A1 Drag bit excavation |
| 05/20/1980 | US4203625 Apparatus for sulfur melting by lateral displacement of heating element |
| 05/20/1980 | CA1077973A1 Radial mining method |
| 05/06/1980 | US4201420 Method of oil recovery by thermal mining |
| 05/06/1980 | US4201419 Control of airblast during explosive expansion in an in situ oil shale retort |
| 05/06/1980 | CA1077068A1 Method of mine backfilling and material therefor |
| 04/29/1980 | US4200366 Microform readers |
| 04/29/1980 | US4200337 Catalyses of uranium oxidation |
| 04/29/1980 | CA1076616A1 Method and apparatus for strip mining |
| 04/22/1980 | US4199192 Method of mining bedded mineral deposits with hydraulic extraction |
| 04/15/1980 | US4198097 Method of mining |
| 04/15/1980 | CA1075729A1 Arrangement for transporting soil from the bottom of basins |
| 04/15/1980 | CA1075728A1 Push pull mining system |
| 04/08/1980 | US4196933 Safety wall cutting through method employed in long wall mining |
| 04/08/1980 | CA1075148A1 Process for recovering viscous, combustible material |
| 04/01/1980 | US4195886 Radial mining method |
| 03/25/1980 | US4194789 Staggered array of explosives for fragmented oil shale formation toward a vertical free face |
| 03/25/1980 | US4194788 Method of forming a rubblized in-situ retort |
| 03/25/1980 | CA1074083A1 Method of and apparatus for melting block sulphur |
| 03/11/1980 | US4192554 Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort |
| 03/11/1980 | US4192553 Method for attenuating seismic shock from detonating explosive in an in situ oil shale retort |
| 03/11/1980 | US4192552 Method for establishing a combustion zone in an in situ oil shale retort having a pocket at the top |
| 03/06/1980 | WO1980000361A1 A method of selective underground mining and stabilization of rock cavities |
| 02/19/1980 | US4189184 Rotary drilling and extracting process |
| 01/29/1980 | US4185871 In-situ retorting system |
| 01/15/1980 | US4183584 Dressing a rock face for abandonment |
| 01/09/1980 | EP0006656A1 Device for winning minerals via a borehole |
| 01/01/1980 | US4181363 Mining method and mining machine for cutting away hard mineral materials |
| 01/01/1980 | US4181362 Liquid seal for production level bulkhead for in situ oil shale retort |
| 01/01/1980 | US4181361 Gas collection system for oil shale retort |
| 12/11/1979 | US4178039 Water treatment and heating in spent shale oil retort |
| 12/04/1979 | US4176883 Oscillating liquid jet system and method for cutting granite and the like |
| 12/04/1979 | US4176882 In situ oil shale retorts with gas barriers for maximizing product recovery |
| 11/13/1979 | US4174135 Underground formed wall single-entry mining method |
| 11/13/1979 | CA1066310A1 Method of extracting coal |
| 10/16/1979 | CA1064528A1 Open pit mine |
| 10/16/1979 | CA1064224A1 Sulfur melting by lateral displacement of heating element |
| 09/11/1979 | US4167291 Method of forming an in situ oil shale retort with void volume as function of kerogen content of formation within retort site |
| 09/04/1979 | CA1061709A1 Subterranean mining apparatus and method |
| 08/28/1979 | US4165903 Injection of a viscosity reducing agent upward into drilled well to form a free-flowing hydrocarbon |
| 08/28/1979 | CA1061249A1 Subterranean drilling and slurry mining |
| 08/21/1979 | CA1060787A1 Coal or lignite field development by underground high pressure gasification |
| 08/07/1979 | US4163580 Pressure swing recovery system for mineral deposits |
| 07/31/1979 | US4162808 In-situ retorting of carbonaceous deposits |
| 06/26/1979 | US4158963 Process for determining the location and/or extent of rock cavities |
| 06/13/1979 | EP0002306A1 Process for transformation of coal in situ, particularly gazification |
| 05/29/1979 | US4156545 Process for heating and chemically treating an aqueous process fluid |
| 05/22/1979 | US4155595 Mining method and apparatus |
| 05/22/1979 | CA1054929A1 In situ recovery of shale oil |
| 05/08/1979 | US4153300 Recovery of fluid fuels by in-situ retorting of carbonaceous deposits |
| 05/08/1979 | US4153299 Combustion air supply to in-situ retorts |
| 05/08/1979 | US4153298 Removal of pillars from a void for explosive expansion toward the void |
| 05/08/1979 | US4153297 Ground water control for an in situ oil shale retort |
| 05/08/1979 | US4153110 Ignition of fragmented oil shale below a sill pillar in an in situ oil shale retort |
| 04/24/1979 | US4150853 Method of strip mining |
| 04/24/1979 | US4150852 Method of strip mining |
| 04/24/1979 | US4150722 Determining the locus of a retorting zone in an oil shale retort by rate of shale oil production |
| 04/17/1979 | US4149752 Controlled rate of combustion |
| 04/17/1979 | US4149595 In situ oil shale retort with variations in surface area corresponding to kerogen content of formation within retort site |
| 04/10/1979 | US4148529 Doping a retort to determine the locus of a processing zone |
| 04/10/1979 | US4148358 Controlling air pollution resulting from combustion of oil shale, in situ |
| 04/03/1979 | US4147389 Method for establishing a combustion zone in an in situ oil shale retort |
| 04/03/1979 | US4147388 Method for in situ recovery of liquid and gaseous products from oil shale deposits |
| 03/27/1979 | US4146272 Explosive placement for explosive expansion toward spaced apart voids |
| 03/27/1979 | US4146125 Bitumen-sodium hydroxide-water emulsion release agent for bituminous sands conveyor belt |
| 03/13/1979 | US4143917 In-situ retorting of oil shale with in-situ formed arches |
| 02/20/1979 | US4140343 Gas withdrawal from an in situ oil shale retort |
| 02/20/1979 | CA1049052A1 Method and apparatus for working deposits |
| 01/23/1979 | US4135762 Quarry operation |
| 01/23/1979 | US4135450 Method of underground mining |
| 01/16/1979 | US4134619 Subterranean mining |
| 01/16/1979 | CA1046402A1 Retorting of oil shale |
| 01/09/1979 | US4133581 Method of strip mining with cable supported conveyor |
| 01/09/1979 | US4133580 Isolation of in situ oil shale retorts |
| 01/09/1979 | US4133380 Establishing a combustion zone below a sill pillar in an in situ oil shale retort |