41
Guy McDowell Jr: Mine roof bolting. Peabody Coal Company, Senniger Powers Leavitt and Roedel, December 1, 1981: US04303354 (25 worldwide citation)

Mine roof bolting using an anchoring fastener comprising a bolt having a head at one end and screw-threaded at said one end, and a nut threaded on the bolt engageable with the head. On turning the nut in one direction, it moves along the bolt away from the head. On turning the nut in the other direc ...


42
Guy McDowell Jr: Mine roof bolting. Peabody Coal Company, Senniger Powers Leavitt and Roedel, June 7, 1983: US04386877 (25 worldwide citation)

Mine roof bolting using an anchoring fastener comprising a bolt having a head at one end and screw-threaded at said one end, and a nut threaded on the bolt engageable with the head. On turning the nut in one direction, it moves along the bolt away from the head. On turning the nut in the other direc ...


43
Rees David Havard: Drilling methods and equipment. Coal, March 21, 1984: GB2126267-A (25 worldwide citation)

A drill bit (5) is steered by the action of pressurised fluid jets (12, 13) emitted from nozzles (9, 10). The jets are in a defined breaking profile directed in a general direction (x) away from an axis (15) extending longitudinally along the borehole (1).


44
Improvements in or relating to sulfur-containing bisphenols. Consolidation Coal Co, July 22, 1970: GB1199871-A (25 worldwide citation)

1,199,871. Sulphur-containing bisphenols. CONSOLIDATION COAL CO. 1 May, 1968 [11 May, 1967 (2)], No. 20551/68. Heading C2C. Alkylidenedithiobisphenols of the formula wherein R 1 is an alkyl group containing 1-4 carbon atoms and R 2 is hydrogen or an alkyl group containing 1-3 carbon atoms. These com ...


45
Robert Trueman, Timothy Gregory Hamilton Meyer, Matthew Stockwell: Fluid drilling system with flexible drill string and retro jets. University of Queensland, Commonwealth Scientific and Industrial Research Organization, BHP Coal, Perkins Coie, March 15, 2005: US06866106 (24 worldwide citation)

A self-advancing drilling system comprising a drilling apparatus, the drilling apparatus having at least one leading fluid cutting nozzle, an advancing device on the drilling apparatus to provide forward movement to the drilling apparatus, the drilling system further comprising a drill string formed ...


46
Arthur A Randell: Spray head. Coal, Stevens Davis Miller & Mosher, August 18, 1981: US04284242 (24 worldwide citation)

A spray head suitable for spraying thickened colliery tailings onto a fluidized combustion bed includes a central aperture for the egress of gas directed towards and surrounded by an annular orifice for the discharge of the material to be sprayed. As the material issues forth in use from the orifice ...


47
Bert Zauderer: Magnetohydrodynamic system and method. Coal Tech, Ratner & Prestia, July 25, 1989: US04851722 (24 worldwide citation)

Apparatus and method for non-equilibrium MHD generation including a cyclone combustor, in which particulate metal is oxidized to form non-gaseous by-products. A low molecular weight working gas, such as hydrogen or helium, is energized by mixture thereof in said cyclone generator. Substantially non- ...


48
Michael David Gray, Geoffrey Michael Kimber, David Ernest Shipley: Manufacture of coke from a coal extract. Coal, Stevens Davis Miller & Mosher, June 29, 1976: US03966585 (24 worldwide citation)

The invention relates to a process for the production of coke having a low mineral matter content which process comprises digesting coal in a high boiling aromatic oil solvent at a temperature within the range of 350.degree.C. to 480.degree.C. separating insoluble matter from the coal digest to give ...


49
William H Kellet, Peter S Mills: Methods of stowing cavities with flowable materials. Coal, Stevens Davis Miller & Mosher, November 2, 1982: US04357167 (24 worldwide citation)

A quick setting cementitious composition with good early strength characteristics contains, by volume, 1-30% of a cement mixture including Portland Cement, calcium aluminate and calcium sulphate, 0.001-5% of clay and water in excess of 65%. The composition is especially suited for filling cavities i ...


50
Dennis Page, Edward J Fox: Method of and apparatus for sensing the ash content of coal. Coal, Stevens Davis Miller & Mosher, December 4, 1984: US04486894 (24 worldwide citation)

The ash content of a granular coal sample having a moisture content greater than 10% by weight is sensed by bombarding it with primary radiation comprising at least two spectrums of energies (46 KeV and 9-17 KeV) to cause radiative reactions in the coal, sensing the secondary radiation generated by ...