Patents
Patents for E21C 35 - Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or (6,127)
10/1976
10/05/1976US3984147 Mining machines with extensible probe arm
09/1976
09/28/1976US3982688 Earth-moving apparatus
09/14/1976US3980340 Method for longwall mining with side-by-side arch sections
09/14/1976US3980338 Method and apparatus for controlling water sprays of an underground extraction machine
08/1976
08/17/1976US3975056 Longwall canted drum mining machine
08/17/1976US3974907 Flexible mobile conveyor
07/1976
07/20/1976US3970353 Locking clip
07/13/1976US3968754 Chain drive arrangement for a mining machine
06/1976
06/29/1976US3967180 Power supply system for extraction machine, especially a drum-cutting machine
06/29/1976US3965797 Control systems and arrangements for use in mineral mining installations
06/01/1976US3961307 Exploration of the boundaries of an underground coal seam
06/01/1976US3960408 Tunnel layout for longwall mining using shields
05/1976
05/25/1976US3958830 Longwall mining system and archshield for mining tar sands, oil shales and the like
05/18/1976US3957311 Scraper chain conveyor with ventilation parts
05/18/1976US3957307 Rough cutter mining tool
05/18/1976US3957305 In situ values extraction
05/18/1976US3957076 Monorail transportation system
05/11/1976US3955593 Conveyor for flexible slurry hose
05/04/1976US3954302 Apparatus for ventilating cutter heads of mineral mining machines
05/04/1976US3954300 Mining machine longwall propulsion means
05/04/1976US3954299 Longwall mining machine with pivotal body adjustment
04/1976
04/20/1976US3950948 Automatic remote control apparatus
03/1976
03/23/1976US3945681 Cutter assembly
03/09/1976US3942838 Bit coupling means
02/1976
02/24/1976US3940754 Fluid detector device in a drive motor for an underground mining machine
02/10/1976US3937517 Protective canopy
02/10/1976US3937151 Mineral mining equipment
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