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Class Information
Number: 299/2
Name: Mining or in situ disintegration of hard material > Tunnel recovery of fluid material
Description: Process or apparatus comprising recovering valuable material in the fluid state from the earth and including (1) process steps involving the construction or use of a horizontal passage in which a human may work or (2) the structure of a horizontal passage in which a human may work.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4296968 |
In situ oil shale retort having horizontally offset pillars |
Oct. 27, 1981 |
| 4294563 |
Thermally insulated bulkhead for in situ oil shale retort |
Oct. 13, 1981 |
| 4290649 |
Method for explosively expanding a pillar for forming an in situ oil shale retort |
Sep. 22, 1981 |
| 4289354 |
Borehole mining of solid mineral resources |
Sep. 15, 1981 |
| 4285547 |
Integrated in situ shale oil and mineral recovery process |
Aug. 25, 1981 |
| 4285548 |
Underground in situ leaching of ore |
Aug. 25, 1981 |
| 4283088 |
Thermal--mining method of oil production |
Aug. 11, 1981 |
| 4283088 |
Thermal--mining method of oil production |
Aug. 11, 1981 |
| 4281878 |
Method for loading explosive laterally from a borehole |
Aug. 4, 1981 |
| 4281877 |
Rock bolting techniques for forming an in situ oil shale retort |
Aug. 4, 1981 |
| 4279302 |
Determining the locus of a processing zone in an oil shale retort by effluent off gas heating value |
Jul. 21, 1981 |
| 4279444 |
Jetting out weak areas for forming an in situ oil shale retort |
Jul. 21, 1981 |
| 4272127 |
Subsidence control at boundaries of an in situ oil shale retort development region |
Jun. 9, 1981 |
| 4269449 |
Method for preparing an oil shale deposit for in situ retorting |
May. 26, 1981 |
| 4266612 |
In situ recovery of shale oil |
May. 12, 1981 |
| 4266826 |
In-situ recovery of constituents from fragmented ore |
May. 12, 1981 |
| 4265485 |
Thermal-mine oil production method |
May. 5, 1981 |
| 4265486 |
Apparatus for in-situ retorting |
May. 5, 1981 |
| 4265307 |
Shale oil recovery |
May. 5, 1981 |
| 4263969 |
Flame front control in underground combustion |
Apr. 28, 1981 |
| 4263970 |
Method for assuring uniform combustion in an in situ oil shale retort |
Apr. 28, 1981 |
| 4262965 |
Triangular blasting into limited voids for vertical free face retorts |
Apr. 21, 1981 |
| 4260192 |
Recovery of magnesia from oil shale |
Apr. 7, 1981 |
| 4252374 |
Determining the locus of a processing zone in an oil shale retort by shale oil composition |
Feb. 24, 1981 |
| 4249602 |
Method of doping retort with a halogen source to determine the locus of a processing zone |
Feb. 10, 1981 |
| 4249603 |
Doping a retort with radioactive nuclides to determine the locus of a processing zone |
Feb. 10, 1981 |
| 4246965 |
Method for operating an in situ oil shale retort having channelling |
Jan. 27, 1981 |
| 4245699 |
Method for in-situ recovery of methane from deeply buried coal seams |
Jan. 20, 1981 |
| 4245865 |
Explosive expansion to a limited void with uniform scaled depth of burial |
Jan. 20, 1981 |
| 4243100 |
Operation of in situ oil shale retort with void at the top |
Jan. 6, 1981 |
| 4241951 |
Recovery of magnesia from oil shale |
Dec. 30, 1980 |
| 4241952 |
Surface and subsurface hydrocarbon recovery |
Dec. 30, 1980 |
| 4239284 |
Situ retort with high grade fragmented oil shale zone adjacent the lower boundary |
Dec. 16, 1980 |
| 4239283 |
In situ oil shale retort with intermediate gas control |
Dec. 16, 1980 |
| 4239285 |
Method of attenuating airblast from detonating explosive in an in situ oil shale retort |
Dec. 16, 1980 |
| 4238136 |
Formation of in situ oil shale retort with void at the top |
Dec. 9, 1980 |
| 4234230 |
In situ processing of mined oil shale |
Nov. 18, 1980 |
| 4231617 |
Consolidation of in-situ retort |
Nov. 4, 1980 |
| 4230368 |
Method for displacing large blocks of earth |
Oct. 28, 1980 |
| 4230181 |
In situ method of processing bituminous coal |
Oct. 28, 1980 |
| 4230367 |
Method of obtaining oil from oil shale deposits |
Oct. 28, 1980 |
| 4227574 |
Locating the top of an in situ oil shale retort for ease of ignition |
Oct. 14, 1980 |
| 4227743 |
Method of thermal-mine recovery of oil and fluent bitumens |
Oct. 14, 1980 |
| 4223726 |
Determining the locus of a processing zone in an oil shale retort by effluent water composition |
Sep. 23, 1980 |
| 4219237 |
Method for maximizing shale oil recovery from an underground formation |
Aug. 26, 1980 |
| 4210366 |
Method of detonating explosives for fragmenting oil shale formation toward a vertical free face |
Jul. 1, 1980 |
| 4202412 |
Thermally metamorphosing oil shale to inhibit leaching |
May. 13, 1980 |
| 4201419 |
Control of airblast during explosive expansion in an in situ oil shale retort |
May. 6, 1980 |
| 4201420 |
Method of oil recovery by thermal mining |
May. 6, 1980 |
| 4200336 |
Means for providing gas seal in production level drift for in situ oil shale retort |
Apr. 29, 1980 |
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