1
Jack E Bridges, George T Dubiel: Power sources for downhole electrical heating. Uentech Corporation, Kinzer Plyer Dorn McEachran & Jambor, March 31, 1992: US05099918 (274 worldwide citation)

Electrical power sources and systems for heating in or adjacent to an oil well or other mineral well, or for heating other earth media, each comprising an A.C. heating generator that generates an A.C. heating current at a selected heating frequency substantially different from the conventional 50/60 ...


2
Jack E Bridges, George T Dubiel, Thomas J Bajzek: Corrosion inhibition apparatus for downhole electrical heating. Uentech Corporation, Kinzer Plyer Dorn McEachran & Jambor, April 24, 1990: US04919201 (37 worldwide citation)

Corrosion inhibition apparatus in an electromagnetic heating system for in situ downhole heating in an oil well or other mineral fluid well that includes an A.C. power source for a high amperage, low frequency heating current (e.g. over 50 amperes at 0.01 to 35 Hz) and a D.C. bias source for generat ...