1
Rajen Puri: Method of underground conversion of coal. Standard Oil Company, Scott H Brown, Robert R Cochran, August 27, 1985: US04537252 (235 worldwide citation)

A method of converting coal and other solid carbonaceous material to gaseous and liquid products by heating the coal in the presence of the gaseous effluent to a sufficient temperature for pyrolyzing the coal to produce liquid and gaseous products. Thereafter, further gasifying the coal to produce a ...


2
Rajen Puri: Method of underground conversion of coal. Amoco Corporation, Fred E Hook, Robert R Cochran, May 5, 1987: US04662439 (229 worldwide citation)

A method of converting coal and other solid carbonaceous material to gaseous and liquid products by heating the coal in the presence of the gaseous effluent to a sufficient temperature for pyrolyzing the coal to produce liquid and gaseous products. Thereafter, further gasifying the coal to produce a ...