| Patents for E21F 17 - Methods or devices for use in mines or tunnels, not covered elsewhere (4,758) |
|---|
| 09/11/1979 | US4167290 Shield type hydraulic tunnel boring machine |
| 07/03/1979 | US4159641 Vibrating wire stress meter |
| 05/29/1979 | US4156514 Cylinder support assembly |
| 05/22/1979 | US4156236 Mine roof movement monitor |
| 05/22/1979 | US4155597 Mineral winning/detaching machines |
| 04/24/1979 | US4150576 Mine roof and wall inspection apparatus and method |
| 04/17/1979 | US4150403 Circuit arrangements for calibrating signals |
| 04/17/1979 | US4149567 Multi-core hydraulic duct |
| 01/30/1979 | US4136999 Canopy and shield structure for a supporting shield in a seam-like mine deposit |
| 01/30/1979 | US4136556 Device to monitor movement of a surface |
| 01/30/1979 | US4136524 Apparatus for sealing access holes to cavities within the earth with rock glass |
| 11/28/1978 | CA1043326A1 Hose training means |
| 11/07/1978 | US4123848 Block profile gauge |
| 10/10/1978 | US4119348 Looped cable control device |
| 10/10/1978 | US4119347 Coal plough having separately adjustable cutters and flexible fluid power and control lines therefor |
| 10/10/1978 | US4118894 Door frame and door assembly for a mine stopping |
| 09/19/1978 | US4114827 Cable reel valve and system |
| 09/12/1978 | US4113985 Mine dial and page phone system |
| 08/29/1978 | USRE29743 Cable attachments |
| 08/29/1978 | US4110742 Alarm circuit |
| 08/29/1978 | US4109471 Method of covering the bottom surface in a gas cavern |
| 08/01/1978 | US4104518 Shut-down apparatus for conveyor belts in underground mines |
| 08/01/1978 | US4103974 Cable carriage and spill-plate housing assembly for a mining machine |
| 07/25/1978 | US4102138 Method for closing off a mine gallery especially for use to prevent spreading of underground explosions |
| 07/04/1978 | US4098415 Method for rotating hose |
| 06/27/1978 | US4097854 Sensing mechanism for mine roof bolting apparatus |
| 06/27/1978 | US4096702 Mine stopping device and method of constructing same |
| 06/13/1978 | US4094189 Micro-creepmeter |
| 05/30/1978 | US4091990 Self-contained instrument for measuring subterranean tunnel wall deflection |
| 04/04/1978 | US4082331 Door for a mine stopping |
| 02/07/1978 | US4072355 Fluid supply duct and pickup for mining machines |
| 01/31/1978 | US4070906 Modified roof strain indicator |
| 01/10/1978 | US4068088 Underground mine equipment |
| 01/03/1978 | US4066992 Seismic mine monitoring system |
| 11/15/1977 | US4058079 Movement indicator |
| 09/13/1977 | US4047683 Pipe hanger |
| 08/16/1977 | US4042198 Pipe hanger |
| 08/02/1977 | US4039032 Hose training means |
| 07/19/1977 | US4036024 Device for closing off a mine gallery especially for use to prevent spreading of underground explosions |
| 05/17/1977 | US4023372 Means to seal-off portions of underground mines and the like |
| 04/26/1977 | US4019706 Pipe hanger |
| 03/01/1977 | US4009649 Mine ventilation control device |
| 01/11/1977 | US4001942 Rod extensometer |
| 11/09/1976 | US3990464 Heat-responsive duct closing method and apparatus |
| 10/26/1976 | US3987667 Self-contained instrument for measuring subterranean tunnel wall deflection |
| 10/19/1976 | US3986339 Storing a substance which, at atmospheric pressure, has a boiling point below 0°C |
| 08/31/1976 | US3977312 Parachute stopping for mine ventilation use |
| 08/03/1976 | US3972272 Mine brattice |
| 07/20/1976 | US3970286 Apparatus for use in stringing power lines |
| 06/01/1976 | US3961307 Exploration of the boundaries of an underground coal seam |
| 05/18/1976 | US3957076 Monorail transportation system |
| 05/18/1976 | US3956926 Stress measuring apparatus |
| 04/06/1976 | US3948057 Portable mine stopping device |
| 03/30/1976 | US3947832 System for protecting persons underground from dangerous areas |
| 03/16/1976 | US3944996 Telemetry alarm system |
| 03/16/1976 | US3944175 Pipe supports and hanger |
| 02/17/1976 | US3938767 Cable tray |
| 01/20/1976 | US3934219 Acoustic method and apparatus for determining effectiveness of mine passage seal |