Halliburton Company

Harold D Fish

John R Dennis

Karl H Kalberer, Jr

Methods and systems employing acoustic techniques are disclosed for determining the level of fluid in a container. Flexural mode acoustic waves are set up in the walls of the container. The change in travel time of flexural mode acoustic waves are measured and calibrated in terms of the level of fluid in the container. Systems for continuously monitoring fluid level or indicating when fluid level reaches a predetermined horizontal level are disclosed.

System and method for determining fluid level in a container

A light assembly for use with apparatus for the inspection of conduits such as underground sewer lines is presented. The light assembly includes a plurality of low energy light sources, and a current interrupting device which interrupts the current to the light sources when the voltage across the light sources exceeds a given voltage.

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Duncan, OK, United States of America

Harold D Fish