| Patent No. | Patent Title: |
| 4561696 | In situ recovery of mineral values |
| 4544206 | Slug-type in situ recovery of mineral values |
| 4535850 | Power-operated fastener tool |
| 4536034 | Method for immobilizing contaminants in previously leached ores |
| 4527837 | Tunnel boring machine |
| 4526230 | Double walled screen-filter with perforated joints |
| 4516636 | Enhanced steam drive recovery of heavy oil |
| 4516807 | Fluid supply systems for rotary cutter heads for mining machines ... |
| 4516876 | Precast concrete expansion joint for roads and the like |
| 4516637 | Hoisting apparatus and method for raising oil tubing |
| 4516808 | Pavement grinding apparatus |
| 4515408 | Counterweight support for resonantly driven tool |
| 4514011 | Power and liquid supply system for mining machines |
| 4514012 | Excavatory machine for use in coal and other mining opertions |
| 4512426 | Rotating bits including a plurality of types of preferential cutt... |
| 4512422 | Apparatus for drilling oil and gas wells and a torque arrestor ... |
| 4512612 | System for mounting tooth-carrier sectors on a cutter wheel or a ... |
| 4512425 | Up-drill sub for use in rotary drilling |
| 4512611 | Oscillated head with bearing support and quick demountability |
| 4512610 | Mining system |
| 4509600 | Pipe base well screen and system for joining a plurality of well ... |
| 4509593 | Downhole mobility and propulsion apparatus |
| 4508182 | Method and apparatus for controlling azimuthal drift of a drill b... |
| 4508390 | Machine for making underground galleries |
| 4508389 | Apparatus and method for hydraulically mining unconsolidated ... |
| 4508470 | Manhole/access cover and frame assemblies |
| 4507105 | Bicycle chainguard |
| 4506735 | Operating system for increasing the recovery of fluids from a dep... |
| 4507106 | Power transmission chain |
| 4505518 | Mineral winning machines |
| 4505517 | Self-advancing mine roof supports |
| 4504251 | Hydraulic chain tensioner |
| 4504093 | Stripper oscillated head with shrouded drive and quick demountabi... |
| 4504248 | Variable and reversible transmission |
| 4502536 | Submersible pump |
| 4502733 | Oil mining configuration |
| 4502813 | Asphalt laying machine |
| 4501576 | Power transmission mechanism |
| 4501449 | Fluid supply for rotary cutter heads for mining machines |
| 4501446 | Removal of fine-grained sediments from water bodies |
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