03933447 is referenced by 113 patents and cites 6 patents.

There is disclosed a method for the gasification of coal in situ which comprises drilling at least one well or borehole from the earth's surface so that the well or borehole enters the coalbed or seam horizontally and intersects the coalbed in a direction normal to its major natural fracture system, initiating burning of the coal with the introduction of a combustion-supporting gas such as air to convert the coal in situ to a heating gas of relatively high calorific value and recovering the gas. In a further embodiment the recovered gas may be used to drive one or more generators for the production of electricity.

Title
Underground gasification of coal
Application Number
5/522170
Publication Number
3933447
Application Date
November 8, 1974
Publication Date
January 20, 1976
Inventor
Charles A Komar
Uniontown
PA, US
William K Overbey Jr
Morgantown
WV, US
Joseph Pasini III
Morgantown
WV, US
Agent
Richard A Lambert
Dean E Carlson
Assignee
The United States of America represented by the United States Energy Research and Development Administration
DC, US
IPC
E21C 43/00
C10J 5/00
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