1
Sidney T Fisher, Charles B Fisher: Extraction from underground coal deposits. Barrigar & Oyen, August 23, 1977: US04043393 (258 worldwide citation)

A method of extracting hydrocarbons, energy and other products in situ from an underground coal deposit. A selected part of the coal deposit is heated by electrical induction to temperatures high enough to effect the destructive distillation of coal. The gases and liquids so produced are collected. ...


2
Fisher Charles B, Fisher Sidney T: Extraction de la houille, Extraction from underground coal deposits. Fisher Sidney T, Fisher Charles B, November 13, 1979: CA1066185

ABSTRACT A method of extracting hydrocarbons, energy andother products in situ from an underground coal deposit. Aselected part of the coal deposit is heated by electricalinduction to temperatures high enough to effect the destructivedistillation of coal. The gases and liquids so produced arecollect ...



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