1
Williams Frank Archer: Improvements in or relating to the underground gasification of coal. Nat Res Dev, June 18, 1952: GB674082-A (259 worldwide citation)

674,082. Destructive distillation in situ. NATIONAL RESEARCH DEVELOPMENT CORPORATION. July 31, 1950 [June 15, 1949], No. 15989/49. Drawings to Specification. Class 55 (ii). In a system for the underground gasification of coal in which a stream of gasifying medium such as air, air mixed with oxygen, ...


2
Improvements in or relating to the underground gasification of coal. Cyril Aubyn Masterman, Ernest Thomas Wilkins, October 29, 1952: GB681720-A

681,720. Underground gasification of coal. MASTERMAN, C. A., and WILKINS, E. T. Dec. 1, 1950 [Nov. 7, 1949], No. 28519/49. Class 55 (ii) An area for combustion in an underground system for gasifying coal is established or extended by ,forcibly pumping a fluid or causing a fluid to permeate through t ...


3
Masterman Cyril Aubyn, Montagnon Philip Edward: Improvements in or relating to the underground gasification of coal. Coal Industry Patents, January 7, 1959: GB807195-A

807,195. Underground gasefication of coal. COAL INDUSTRY (PATENTS) Ltd. March 12, 1957 [March 16, 1956], No. 8285/56. Addition to 762,484. Class 55 (2). In a modification of the parent Specification for the underground gasefication of coal water or other vaporizable cooling liquid is entrained in th ...