1
Paul C Johnson, Arthur L Otermat, Charles C Chou: In situ decontamination of spills and landfills by focussed microwave/radio frequency heating and a closed-loop vapor flushing and vacuum recovery system. Shell Oil Company, December 31, 1991: US05076727 (97 worldwide citation)

Moist, warm, clean air from a vapor treatment system is injected into wells which are screened only at the contaminated depth forcing vapor flow only through the contaminated region. Intermediate the injection wells is an extraction well which is also screened only at the contaminated depth. A vacuu ...


2
Paul C Johnson, David A Weingaertner, Lynton W R Dicks, Arthur L Otermat, Arnold R Marsden Jr: Enhanced deep soil vapor extraction process and apparatus for removing contaminants trapped in or below the water table. Shell Oil Company, December 21, 1993: US05271693 (50 worldwide citation)

An Enhanced Deep Soil Vapor Extraction Process and Apparatus utilizes heaters placed into the soil at least to the depth of contamination and a vapor/condensate extraction system that withdraws volatilized contaminant vapors from the subsurface and any condensate that collects in the extraction well ...


3
Paul C Johnson, James D Colthart, Arthur L Otermat, David A Weingaertner, Charles C Chou, Dallas L Byers, Stephen M Stearns, Arnold R Marsden Jr, George M Deeley: Soil decontamination. Shell Oil Company, May 19, 1992: US05114497 (50 worldwide citation)

An improved process for the remediation of soil contaminated by the presence therein of organic or semi-volatile inorganic contaminants which comprises (1) supplying thermal energy to the soil at one or more locations under the surface of the soil, (2) collecting the vapors resulting from contaminan ...


4
Arnold R Marsden Jr, Arthur L Otermat, David A Weingaertner, Paul C Johnson, Lynton W R Dicks, Harvey B Wilde: Heater blanket for in-situ soil heating. Shell Oil Company, June 22, 1993: US05221827 (31 worldwide citation)

A soil heater assembly (SHA) utilizes for example, two or more, 5 ft by 10 ft heating sections rigidly bolted together. Each section contains three NICHROME heating elements encased in ceramic beads which are floatingly pinned to a 4-inch thick ceramic fiber insulation encased in NEXTEL cloth. The h ...