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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method for assessing one or more temperatures of an electrically powered subsurface heater includes accessing an impedance profile of the electrically powered subsurface heater while the heater is being operated in the subsurface. The impedance profile is analyzed with a frequency domain algorithm to assess one or more temperatures of the heater.
Burns, David (Houston, TX), Sandberg, Chester Ledlie (Palo Alto, CA)
12/ 250,303
October 13, 2008
GOVERNMENT INTEREST [0003] The Government has certain rights in the invention pursuant to Agreement Nos. SD 10634 and NFE 062050824 between Sandia National Laboratories (operating under Agreement DE-AC04-94AL85000Sa for the U.S. Department of Energy) and Shell Exploration and Production Company.