History
Three-phase heating (see Technology below) was originally created to enhance oil recovery. This design was patented in 1976 by Bill Pritchett of ARCO. The patent has expired and is now available for public use.
Six-phase heating (see Technology below) was created and patented for the US Department of Energy (DOE) in the 1980s for use on DOE sites as well as commercial applications.
Read more about this topic: Electrical Resistance Heating Remediation
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