Patents
Patents for E21C 29 - Propulsion of machines for slitting or completely freeing the mineral from the seam (839)
05/1979
05/15/1979US4154480 Mineral mining installation
05/15/1979US4154479 Hauling system for underground workings
02/1979
02/20/1979US4140951 Mining machine
01/1979
01/23/1979CA1047053A1 Device for guying a movable cutting machine
12/1978
12/26/1978US4131317 Mining machine having advancing mine roof supports
12/19/1978US4130319 Mining machines
10/1978
10/03/1978US4118072 Variable wall mining machine
09/1978
09/05/1978US4111489 Stacked mineral mining plows independently driven or coupled
08/1978
08/01/1978US4103975 Mining machine particularly a drum-cutter mining machine
07/1978
07/11/1978US4099787 Mining machine
07/11/1978US4099786 Apparatus for drawing the shearers
06/1978
06/27/1978US4097091 Method and apparatus for securing mining machines employed on inclined or steep seams
06/20/1978US4095478 Sprocket-wheel, especially for mining machines
06/13/1978US4094157 Anchoring apparatus for anchoring a mining installation
05/1978
05/09/1978US4088370 Haulage arrangements for mineral mining machines
05/02/1978US4087132 Device for guying a movable cutting machine
04/1978
04/18/1978US4084854 Drag bit excavation
04/04/1978US4082361 Rack device for a mining machine
03/1978
03/14/1978US4078452 Drive systems for mining apparatus
02/1978
02/28/1978US4076317 Device for guying a movable cutting machine
01/1978
01/10/1978US4067620 Rack-driven mining machine with pivotal guide shoe
12/1977
12/20/1977US4063782 Long wall mining apparatus guide structure
10/1977
10/25/1977US4055367 Longwall machine with captivating bracket
10/18/1977US4054321 Track-mounted shoe-supported inclining mining machine
09/1977
09/20/1977US4048866 Apparatus for use in controlling the tension of a chain or chains of mining equipment
08/1977
08/30/1977US4045083 Longwall mining machine with haulage motor sensed pressure controlled rail brake
08/23/1977US4043213 Drive assemblies for mining apparatus
07/1977
07/26/1977US4037876 Tightening arrangement for longwall mining machine cable and conveyor
05/1977
05/24/1977US4025120 Feed system of a coal getting combine
03/1977
03/29/1977US4014574 Mining machine having rectangular thrust transmitting conveyor column
02/1977
02/08/1977US4006937 Carriage especially for use in mines
12/1976
12/28/1976US3999488 Gripping drivers locomotive
11/1976
11/09/1976US3990349 Device for effecting translational movement of a machine
09/1976
09/14/1976US3980342 Auger type mining machine
08/1976
08/17/1976US3975056 Longwall canted drum mining machine
07/1976
07/13/1976US3968754 Chain drive arrangement for a mining machine
05/1976
05/04/1976US3954300 Mining machine longwall propulsion means
04/1976
04/13/1976US3949815 Shallow-hole kerf boring machine with auger on side-arm elevating assembly
02/1976
02/10/1976US3937151 Mineral mining equipment
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