Additional Patents Pending. All rights reserved. Patent finally issued on appeal. Claims current flow in soil, heating of soil by said current flow, and vacuum means for removing contaminant from heated soil.
Original date precedes six phase heating patents.
Patent 5,553,189 Radiant Plate Surface Heating Blanket, Stegemeier, G L., Vinegar, H. J, and Carl, F. G., issued September 3, 1996. Improvement patent on 4,984,594 . Claims a radiant surface heater that need not be in contact with soil surface. Utilizing Thermal Conduction Heating, Vinegar, H. J. and Stegemeier, G. L. issued June 7, 1994. Improvement patent on 5,190,405.