61
Laurence W Jones: Speed indication system. Kooragang Coal Management, Armstrong Nikaido Marmelstein Kubovcik & Murray, July 31, 1990: US04944474 (20 worldwide citation)

A system and method for indicating the speed of a locomotive during low speed continuous loading and or unloading of bulk materials such as coal. The system utilizes treadle switches which are equally spaced along a track, the treadle switches generating positional information which is transmitted t ...


62
John E Sague: Slew ring bearing. Quintette Coal, Seed and Berry, March 6, 1990: US04906113 (20 worldwide citation)

A slew ring bearing for coupling the superstructure of a large piece of heavy equipment to the base having an inner ring attachable to the underside of the superstructure and an outer ring having gear teeth on its outer cylindrical surface concentric with the inner ring and attachable to a stationar ...


63
Poundstone William N: Method of mining with a programmed profile guide for a mining machine. Consolidation Coal Company, Miller William J, November 25, 1975: US3922015 (20 worldwide citation)

A method for mining a mineral deposit underground in a vein having an underburden and an overburden which comprises boring a pilot hole into the vein between the underburden and the overburden. The thickness of the material is then measured at predetermined distances along the pilot hole, between th ...


64
Vernon C Evans, George H Heidinger: Switching and testing system. Peabody Coal Company, Senniger Powers Leavitt and Roedel, June 20, 1989: US04841159 (19 worldwide citation)

A switching system for powering first and second electrical loads from a voltage supply, the electrical loads being operable from controls and adapted to be connected to the voltage supply by the switching system. The switching system includes switching circuitry having a control element which is re ...


65
Leonard J Heavin, Edward E King, Dennis L Milliron: Process for blending coal with water immiscible liquid. The Pittsburg & Midway Coal Mining Co, Roylance Abrams Berdo & Farley, October 26, 1982: US04356078 (19 worldwide citation)

A continuous process for blending coal with a water immiscible liquid produces a uniform, pumpable slurry. Pulverized raw feed coal and preferably a coal derived, water immiscible liquid are continuously fed to a blending zone (12 and 18) in which coal particles and liquid are intimately admixed and ...


66
Granville C James, Gerald K Burnard: Dust filter apparatus. Coal, James C Wray, November 27, 1984: US04484937 (19 worldwide citation)

Dust filter apparatus comprises a first, coarse dust removal stage constituted by a plurality of swirl chamber devices into which a liquid is sprayed and a second, fine dust removal stage constituted by a wetted filter panel.


67
Donald Bremner Urquhart: Hydrogenation of coal. Coal, Stevens Davis Miller & Mosher, April 26, 1977: US04019975 (19 worldwide citation)

The invention relates to the hydrogenation of coal which comprises extracting the coal with a solvent at temperatures and pressures above the critical temperature and pressure of the solvent in the presence of hydrogen and an effective amount of catalyst comprising a salt or oxide of a metal which i ...


68
Ronald Corso: Process stabilizing process controller. Amax Coal West, Sheridan Ross & McIntosh, January 23, 1996: US05486998 (19 worldwide citation)

A process controller is disclosed for controlling a process. The process controller includes a process supervisor for accessing process control data clusters from a library. Each data cluster provides control data, e.g., setpoints, deadbands, execution frequencies and alarm ranges for process actuat ...


69
Gavin Derek Gabriel, Richards David Gareth: Synthesis gas conversion process.. Coal Industry Patents, January 20, 1988: EP0253540-A1 (19 worldwide citation)

A mixed alcohol product containing little or no methanol can be produced from synthesis gas by a process incorporating the synthesis of alcohols over a catalyst, the fractionation of the product to yield a desired mixed alcohol product and a fraction containing methanol, and recycling the methanol f ...


70
Nicholas Syred, Martin Biffin, Ieuan Owen: Cyclone separators. Coal, Stevens Davis Miller & Mosher, April 29, 1986: US04585466 (19 worldwide citation)

An improved cyclone separator comprises a body defining a main vortex chamber having an inlet and a fluid outlet. A secondary vortex chamber communicates with and opens into the main vortex chamber.