Patent 8171786 was granted and assigned to Petroleum Recovery Services on May, 2012 by the United States Patent and Trademark Office.
An ultrasonic-based or radar-based apparatus and method for fuel inventory measurements and for the detection and characterization of materials in a fuel tank, including sludge, water, microorganisms and materials of different viscosities and densities that are present in the tank, presented in an easy-to-interpret picture display that can be remotely located from the tank.