Texaco Inc.

Ralph C Muller

Jerry L Nolting

Thomas R Decker

A highly sensitive liquid level detection system. It employs a piezoelectric transducer that has a natural frequency of vibration which effectively varies depending upon the amount that the transducer is immersed in a liquid. An emf is applied to the transducer to cause it to vibrate at the effective natural frequency, and the exact frequency is counted which count indicates the amount of immersion with a high degree of accuracy. A printer may be employed to periodically record the frequency count.

Ultra sensitive liquid level detector and method

A combination of elements for use with an underground tank that has a fill tube which is below ground level and subject to rainwater immersion. It has special application to a fill tube closure that has a small diameter passageway to maintain atmospheric pressure in the fill tube. It includes a float valve to close the passageway if the rainwater rises above a given level adjacent to the top of the fill tube.

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Hopewell Junction, NY, United States of America

Ralph C Muller