05420402 is referenced by 11 patents and cites 44 patents.

Improved methods and apparatus are disclosed for confining ohmic heating currents to a subsurface formation in the use of in situ ohmic heating for recovery of volatile and semi-volatile materials, such as hazardous waste, hydrocarbon-like materials, and valuable minerals having thermally responsive properties. Spacing between emplaced electrodes and the number of electrodes employed are controlled to cause coupling between electrodes for more uniform and higher temperature heating. Electrode designs are disclosed which suppress spurious earth currents which would heat other formations not of interest. Suppression of electrode end currents is accomplished by the use of distinct rings of insulation, control of the applied potential along the electrode, and injection or withdrawal of fluids at distinct locations along the electrode.

Title
Methods and apparatus to confine earth currents for recovery of subsurface volatiles and semi-volatiles
Application Number
7/831589
Publication Number
5420402
Application Date
February 5, 1992
Publication Date
May 30, 1995
Inventor
Guggilam C Sresty
Burbank
IL, US
Jack E Bridges
Park Ridge
IL, US
Agent
Fitch Even Tabin & Flannery
Assignee
IIT Research Institute
IL, US
IPC
H05B 6/54
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